improve bugs.html and contact.html

Improved some excessively long headings from `bugs.md`.

Removed unused "STATUS: missing make rules" from `bugs.md`.

Add "Jump to: top" near the bottom of `bugs.html`.

Add "Jump to: top" near the bottom of `contact.html`.

Run `make gen_top_html` to perform the above.

contact.html

@@ -181,6 +181,8 @@ information on Mastodon.</p>
 <p>You <strong>MUST</strong> include the following two words (separated by a space) in the subject of your email, otherwise the email will be rejected:</p>
 <pre><code>    IOCCC YYYY</code></pre>
 <p><strong>IMPORTANT:</strong> The <em>YYYY</em> in the above Email address <strong>MUST</strong> be changed to the current 4 digit year!</p>
+<hr style="width:10%;text-align:left;margin-left:0">
+<p>Jump to: <a href="#">top</a></p>
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