Fix check_links.py errors

Since the website is temporarily down, it was easy to find instances of
absolute URLs for internal tags and replace them with relative ones.
Some source code links also needed updating after their master branch
was renamed to main.

Author: calcmogul

admin/goals/index.html

@@ -335,12 +335,11 @@ <h3 id="Veterans">Veterans</h3>
     engineering is what we really want to teach you. If you can explain this
     year's robot code and why you designed it <i>that</i> way versus the other
     possible designs, you have succeeded and have likely earned a <a href=
-    "https://frc3512.github.io/admin/varsity/">varsity letter</a>. It shows you
-    contributed in the design phase and know the trade-offs (engineering is
-    essentially the process of choosing the least bad design based on some
-    criteria and justifying that choice). Our role as mentors is to show you
-    what tools are available in the C++ language so you can make an informed
-    design decision.</p>
+    "../varsity/">varsity letter</a>. It shows you contributed in the design
+    phase and know the trade-offs (engineering is essentially the process of
+    choosing the least bad design based on some criteria and justifying that
+    choice). Our role as mentors is to show you what tools are available in the
+    C++ language so you can make an informed design decision.</p>
   </div>
 </body>
 </html>

admin/software-for-non-software-team-members/index.html

@@ -45,9 +45,8 @@ <h1>Software for non-software team members</h1>
     <p>Since you mentioned on Tuesday that the team was putting together more
     formal varsity letter requirements, you may be interested in the
     requirements the software team has been using for the last 2+ years. They
-    are linked on <a href=
-    "https://frc3512.github.io/admin/">https://frc3512.github.io/admin/</a>.
-    This email was originally intended just to mention that, but the fact that
+    are linked on <a href="../">https://frc3512.github.io/admin/</a>. This
+    email was originally intended just to mention that, but the fact that
     varsity letter requirements are even an issue implies there are more
     systemic issues. The rest of this email elaborates on what I mean and how I
     feel these issues should be addressed.</p>
@@ -99,7 +98,7 @@ <h2 id="What_leadership_should_know_about_the_software_team">What
     <ol>
       <li>We have standard operating procedures and our own set of goals. They
       are detailed in <a href=
-      "https://frc3512.github.io/admin/goals/">https://frc3512.github.io/admin/goals/</a>.
+      "../goals/">https://frc3512.github.io/admin/goals/</a>.
       </li>
       <li>Software is not magic that makes the robot move. Robots follow simple
       instructions and basic logic, and you can write them yourself in English
@@ -129,12 +128,12 @@ <h2 id="What_leadership_should_know_about_the_software_team">What
         https://github.com/frc3512</a>.
       </li>
       <li>All our curriculum is online: <a href=
-      "https://frc3512.github.io/ci/">https://frc3512.github.io/ci/</a>.
-      Everything the software team learns on a yearly basis is documented there
-      somewhere. This is how we've managed to do consistently well with just
-      one local mentor and one mentor that's typically hours away. The rest of
-      the team should consider documenting what they know somewhere so that
-      knowledge isn't lost every time a student graduates.
+      "../../ci/">https://frc3512.github.io/ci/</a>. Everything the software
+      team learns on a yearly basis is documented there somewhere. This is how
+      we've managed to do consistently well with just one local mentor and one
+      mentor that's typically hours away. The rest of the team should consider
+      documenting what they know somewhere so that knowledge isn't lost every
+      time a student graduates.
       </li>
       <li>The software team is not an IT department. When the Driver Station
       stops connecting to the robot, we're just as clueless as you are. We

admin/varsity/index.html

@@ -70,15 +70,13 @@ <h1>Varsity letter requirements</h1>
       <li>Actively found ways to make meaningful contributions</li>
       <li>Basic knowledge
         <ol class="sub">
-          <li>Is proficient in <a href=
-          "https://frc3512.github.io/ci/intro-to-cpp/">C++</a>
+          <li>Is proficient in <a href="../../ci/intro-to-cpp/">C++</a>
           </li>
           <li>Can use version control effectively</li>
           <li>Exercises <a href="../styleguide/">clean coding practices</a>
           </li>
-          <li>See <a href=
-          "https://frc3512.github.io/admin/goals/#Learning_Outcomes">our
-          learning outcomes</a> for more
+          <li>See <a href="../goals/#Learning_outcomes">our learning
+          outcomes</a> for more
           </li>
         </ol>
       </li>

archives/angelscript/download/index.html

@@ -40,7 +40,7 @@
         <div id="content" class="textbox">
           <h1>Download</h1>
           <p><a href=
-          "https://codeload.github.com/frc3512/ScriptRobot/zip/master">Download
+          "https://codeload.github.com/frc3512/ScriptRobot/zip/main">Download
           Source</a></p>
           <p>&lt;Instructions here&gt;</p>
         </div>

ci/intro-to-cpp/index.html

@@ -105,8 +105,7 @@ <h3 id="Advanced">Advanced</h3>
     language should read chapters 17-21 from Part III in order. They cover data
     structures, algorithms, memory management, and templates.</p>
     <h2 id="Submission">Submission</h2>
-    <p>See the <a href="https://frc3512.github.io/ci/#Submission">CI submission
-    instructions</a>.</p>
+    <p>See the <a href="../#Submission">CI submission instructions</a>.</p>
     <p>For files which are modified between assigned problems, there should
     still be a separate project for each problem. For example, chapter 4's
     exercises 19 through 21 will have a separate project each for

ci/intro-to-git/lecture/index.html

@@ -81,7 +81,7 @@ <h1>Installation</h1>
         <ul>
           <li>
             <a href=
-            "https://frc3512.github.io/bootstrap/#Git">https://frc3512.github.io/bootstrap/#Git</a>
+            "../../../bootstrap/#Git">https://frc3512.github.io/bootstrap/#Git</a>
           </li>
         </ul>
       </section>

ci/intro-to-real-time-software/lecture/index.html

@@ -201,15 +201,14 @@ <h1>Resources</h1>
           <ul>
             <li>
               <a href=
-              "https://frc3512.github.io/ci/intro-to-real-time-software/">https://frc3512.github.io/ci/intro-to-real-time-software/</a>
+              "../">https://frc3512.github.io/ci/intro-to-real-time-software/</a>
             </li>
           </ul>
           <li>Atomics in C++</li>
           <ul>
             <li>
               <a href=
-              "https://frc3512.github.io/ci/advanced-cpp/concurrency-and-atomics/">
-              https://frc3512.github.io/ci/advanced-cpp/concurrency-and-atomics/</a>
+              "../../advanced-cpp/concurrency-and-atomics/">https://frc3512.github.io/ci/advanced-cpp/concurrency-and-atomics/</a>
             </li>
           </ul>
         </ul>

ci/robot-software/index.html

@@ -147,7 +147,7 @@ <h3 id="Drivetrain_with_joysticks">Drivetrain with joysticks</h3>
       </li>
     </ul>
     <p>See <a href=
-    "https://github.com/wpilibsuite/allwpilib/blob/master/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp">
+    "https://github.com/wpilibsuite/allwpilib/blob/main/wpilibc/src/main/native/cpp/drive/DifferentialDrive.cpp">
     DifferentialDrive.cpp</a> for examples.</p>
     <h3 id="Button_edge_detection">Button edge detection</h3>
     <p>In <code>TeleopPeriodic()</code>, performing actions when the user
@@ -253,7 +253,7 @@ <h3 id="Actuate_motor_to_several_points_quickly">Actuate motor to several
     instead. See the labs in the <a href="../state-machines/">state
     machines</a> module for examples on how to do this.</p>
     <p><a href=
-    "https://github.com/wpilibsuite/allwpilib/blob/master/wpilibcExamples/src/main/cpp/examples/Encoder/cpp/Robot.cpp">
+    "https://github.com/wpilibsuite/allwpilib/blob/main/wpilibcExamples/src/main/cpp/examples/Encoder/cpp/Robot.cpp">
     WPILib's encoder example</a> may be helpful.</p>
     <h2 id="Project_setup">Project setup</h2>
     <p>Each year, a new robot project will need to be created in Gerrit (our

ci/state-machines/event-framework/index.html

@@ -137,8 +137,7 @@ <h2 id="Implementation">Implementation</h2>
     recommend adding print statements upon entering and exiting your states so
     the state machine's progress is externally visible.</p>
     <h2 id="Submission">Submission</h2>
-    <p>See the <a href="https://frc3512.github.io/ci/#Submission">CI submission
-    instructions</a>.</p>
+    <p>See the <a href="../../#Submission">CI submission instructions</a>.</p>
     <p>Use the project name <code>event-framework</code>. Once you are
     confident your state machine works, let your instructor know and they will
     review your work.</p>

ci/state-machines/index.html

@@ -58,9 +58,9 @@ <h2 id="State_machines">State machines</h2>
     state transition. If a transition occurs, code may be executed when leaving
     a state. See the state machine labs for more. Our 2015 robot code had a
     <a href=
-    "https://github.com/frc3512/Robot-2015/blob/master/src/main/include/StateMachine.hpp">
+    "https://github.com/frc3512/Robot-2015/blob/main/src/main/include/StateMachine.hpp">
     state machine</a> class to manage state machines and a <a href=
-    "https://github.com/frc3512/Robot-2015/blob/master/src/main/include/State.hpp">
+    "https://github.com/frc3512/Robot-2015/blob/main/src/main/include/State.hpp">
     state</a> class to contain lambdas of code to perform the aforementioned
     actions.</p>
     <p>State machines can be used to automate a sequence of actions. We use
@@ -78,7 +78,7 @@ <h2 id="State_machines">State machines</h2>
     This verbosity is why our 2015 robot used custom state machine management
     classes; we only had to assign a few lambdas instead of writing boilerplate
     classes, like <a href=
-    "https://github.com/frc3512/Robot-2015/blob/master/src/main/cpp/autonomous/AutoOneCanLeft.cpp">
+    "https://github.com/frc3512/Robot-2015/blob/main/src/main/cpp/autonomous/AutoOneCanLeft.cpp">
     this</a>.</p>
   </div>
 </body>