Update .gitignore, Gemfile, and various job classes for improved functionality

- Added '*.notes.md' and '*.export' to .gitignore to prevent unnecessary files from being tracked.
- Refactored job classes in the Domain::Fa module to enhance logging and job enqueuing processes, including:
  - Improved logging messages in Domain::Fa::Job::Base for better clarity.
  - Added support for a new 'enqueue_favs_scan' option in user job processing.
  - Enhanced the FavsJob to utilize active fav post joins and added a 'removed' flag for better management of favorites.
- Updated user and post models to include scopes for active favorites and improved error handling in user creation.
- Enhanced the page parser to support new formats for favorites pages and added tests for these changes.

.gitignore

@@ -12,6 +12,8 @@ lib/xdiff
 ext/xdiff/Makefile
 ext/xdiff/xdiff
 
+*.notes.md
+
 # Ignore bundler config.
 /.bundle
 
@@ -54,4 +56,4 @@ ext/xdiff/xdiff
 yarn-debug.log*
 .yarn-integrity
 .DS_Store
-*.export
+*.export