I Upgraded This Site
About 1087 days later, I finally made some progress in implemeting the software previously mentioned. It is implemented in Python using Flask, docutils, Dulwich, and Whoosh. The code is not very good yet but it should be fairly efficient. The slowest part is currently docutils, taking up about half the time for responding to a request.
As of the time of this writing, it is capable of showing individual pages and indexing messages by date. It can also show the commits changing each posting.
In addition, I changed the graphical appearance of this site. It is now entirely grayscale, monospaced, and the site logo is monochrome, using some MacPaint halftone patterns.