Move _site' styles into _content
Add .entry-header and .entry-footer classes
Rename .banner to .site-header
Remove `echo is_home()` from the homepage
Remove a blank line from the bottom of index.php
Rename some comment-related elements to use classes instead of IDs
Add a special comments-proof file for comments on proofs
Remove the sidebar from base.php
Remove ' Single' from entries that use standalone-single.php
Remove the comments area on single posts