Add checklist items to star and join

src/templates/to-do-checklist.html

@@ -14,4 +14,6 @@
    <li id=labeling>     <p>Purchase a product for its better metric labeling</p>                                  <label><input type=checkbox><b></b></label></li>
    <li id=family-recipe><p>Convert a family recipe to metric and share</p>                                        <label><input type=checkbox><b></b></label></li>
    <li id=comment>      <p>Use metric units in a social media comment</p>                                         <label><input type=checkbox><b></b></label></li>
+   <li id=github>       <p>Star the <a href=https://github.com/center-key/think-metric>think-metric</a> project on GitHub</p> <label><input type=checkbox><b></b></label></li>
+   <li id=reddit>       <p>Join <a href=https://www.reddit.com/r/ThinkMetric>r/ThinkMetric</a> on Reddit</p>      <label><input type=checkbox><b></b></label></li>
 </ol>

src/website/article/rules/index.html

@@ -87,8 +87,8 @@ <h2>Don't lie about elephants being imperial units</h2>
          storytelling.&nbsp;
          Authors incorporate frames of reference to create interesting visualizations, and
          communication would be more dull without them.&nbsp;
-         The size of elephant is neither imperial nor metric, so don't say that a frame of
-         reference is a way to avoid metric.&nbsp;
+         An elephant is neither imperial nor metric, so don't claim that a frame of reference is a
+         way to avoid just metric.&nbsp;
       </p>
    </section>