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.md

@@ -49,7 +49,7 @@ Contact [David McInnis](https://www.alchemistproductiondesign.com)
 for creative director & producer services.
 
 
-# Support Patreon
+# Support the IOCCC
 
 You can always participate in the IOCCC for **free**. The official IOCCC
 website and its archives will always be ad-free. This is **really important