Switch to ABlog

[Robpol86]

https://ablog.readthedocs.io/en/stable/

Looks like this is actually a dependency for sphinx-book-theme (edit: just a dependency for their documentation, not a core project dependency). Abandon my DIY approach and use ablog. I looked into this years ago but avoided it because of a disclaimer stating the project is in maintenance mode. Right now it says it only adds new features needed by the organization, but the project is definitely not dead.

Investigate if ablog's feature set is suitable for my needs. If so make it a primary dependency of this project.

[Robpol86]

• after release:
  • google search validator
  • refactor htaccess and enablg logging to confirm rules work as expected
  • log 404s and confirm me visiting bad pages logs correctly
  • ablog feeds (rss?)
  • new desk photos posts
  • new homelab photos posts
  • fix imgur-embed in latest sphinx

[Robpol86]

Done migrating and created issues for the post-release tasks.