:lipstick: Post navigation arrows in CSS

Plus other improvements and refinements (display: block on link
elements, offset arrows so that wrapping text aligns, etc.)
Improve color consistency + use of variables
Don't show resume link in site-nav in mobile
:lipstick: Blockquote line-height fix
Hacky one-time fix for .standout link styling
Content revisions + markdown style consistency
Refactor how oversized images are handled

Simpler solution with simpler JS to support it
Remove getElementsByClassName shim

Plus a tiny comment change
Replace heavy #content ID selector with article

Causes issues with overriding styles
:lipstick: Add basic button styles
Add image-comparison-toggling functionality

JS logic, accompanying styles, plus example use of it in the draft post
Rename draft post
Compiled CSS with latest changes
Publish post about subpixel antialiasing