Link + stylistic fixes

Author: Jordan Poles

doc/_static/cadquery_cheatsheet.html

@@ -41,6 +41,7 @@
     td {
       text-align: center;
       width: 5em;
+      padding: 3px 4px;
     }
     h1 {
       margin: 10px;
@@ -91,9 +92,14 @@ <h2><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/apirefere
             <tr>
               <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.text">Workplane.text</a><br>(txt, fontsize, distance)</td>
               <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.revolve">Workplane.revolve</a><br>(angleDegrees)</td>
-              <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.extrude">Workplane.intersect</a><br>(toIntersect)</td>
+              <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.intersect">Workplane.intersect</a><br>(toIntersect)</td>
             </tr> 
-          </table>
+          <tr>
+            <td></td>
+            <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.union">Workplane.union</a><br>(angleDegrees)</td>
+            <td></td>
+          </tr> 
+        </table>
       </div>
       <div class="section">
           <h2><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/apireference.html#d-operations">2D Construction</a></h2>
@@ -119,8 +125,6 @@ <h2><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/apirefere
               <td><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/classreference.html#cadquery.Workplane.polyline">Workplane.polyline</a><br>(listOfXYTuple)</td>
             </tr>
           </table>
-      </div>
-      <div class="section">
           <h2><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/apireference.html#sketch-initialization">Sketching</a></h2>
           <table>
             <tr>
@@ -206,9 +210,9 @@ <h2>BREP Terminology</h2><br />
         </table>
       </div>
       <div class="section">
-        <h2>Selector String Modifiers</h2><br />
-        <div class="section-subtitle">See <a target="_blank" href="https://cadquery.readthedocs.io/en/latest/selectors.html">CadQuery String Selectors</a> for more information.<br />
-        Axis Strings are: X, Y, Z, XY, YZ, XZ</div>
+        <h2><a target="_blank" href="https://cadquery.readthedocs.io/en/latest/selectors.html">Selector String Modifiers</a></h2>
+        <h2></h2><br />
+        <div class="section-subtitle">Axis Strings are: X, Y, Z, XY, YZ, XZ</div>
         <table>
           <tr>
             <th style="width:10%;">Modifier</th>