improve social.html and sitemap

We improve the text in the top level `social.html` page.

Added a number of missing files to the sitemap.

Changed `bin/gen-sitemap.sh` VERSION from "2.0.1 2025-04-28"
to "2.0.2 2025-07-30".

Ran `make social sitemap` to perform the above.

social.html

@@ -491,7 +491,7 @@ is produced by, and the <a href="https://discord.gg/Wa42Qujwnw">IOCCC Discord Se
 by <a href="https://www.alchemistproductiondesign.com">David McInnis</a>.</p>
 <p>Contact <a href="https://www.alchemistproductiondesign.com">David McInnis</a>
 for creative director &amp; producer services.</p>
-<h1 id="support-patreon">Support Patreon</h1>
+<h1 id="support-the-ioccc">Support the IOCCC</h1>
 <p>You can always participate in the IOCCC for <strong>free</strong>. The official IOCCC
 website and its archives will always be ad-free. This is <strong>really important
 to us</strong>.</p>