v2.15.1
remove styles that reference images
Add updated icons
fix: improve HTML sanitization
fix typo
default.css: update list-style comments to match reality
Implement forgot-to-render check on Fastmail
upgrade a lot of URLs to https
update highlight.js to v11.11.1
Changed all file permissions to 644 (until Cygwin screws it up again...)
Update colors for upgrade notification and forgot-to-render prompt