install page: remove "build from source" note on Linux/Mac

We already have a "Build from source" page

Author: jvns

content/install/linux.html

@@ -10,12 +10,10 @@
   {{< install-header "linux" >}}
 
     <div class="install-content">
-      <p>It is easiest to install Git on Linux using the preferred package
-  manager of your Linux distribution. If you prefer to build from
-  source, you can find tarballs
-  <a href="https://www.kernel.org/pub/software/scm/git/">on kernel.org</a>.
-  The latest version is
-  <a href="https://www.kernel.org/pub/software/scm/git/git-{{< site-param latest_version >}}.tar.gz">{{< site-param latest_version >}}</a>
+  <p>
+      It is easiest to install Git on Linux with your distribution's package
+      manager.
+  </p>
   <h3>Debian/Ubuntu</h3>
   <p>For the latest stable version for your release of Debian/Ubuntu</p>
   <code># apt-get install git</code>

content/install/mac.html

@@ -27,13 +27,6 @@ <h3>MacPorts</h3>
   <h3>Xcode</h3>
   <p>Apple ships a binary package of Git with <a href="https://developer.apple.com/xcode/">Xcode</a>.</p>
 
-  <h3>Building from Source</h3>
-  <p>If you prefer to build from source, you can find tarballs
-  <a href="https://www.kernel.org/pub/software/scm/git/">on kernel.org</a>.
-  The latest version is
-  <a href="https://www.kernel.org/pub/software/scm/git/git-{{< site-param latest_version >}}.tar.gz"%>{{< site-param latest_version >}}</a>.
-  </p>
-
   <h3>Installing git-gui</h3>
   <p>If you would like to install <a href="https://git-scm.com/docs/git-gui/">git-gui</a> and <a href="https://git-scm.com/docs/gitk/">gitk</a>,
   git's commit GUI and interactive history browser, you can do so using <a href="https://brew.sh/">homebrew</a><br>