* Fixes for search on docs site
We previously didn't include the search results page in our CI testing,
so we missed some issues on that page. This ensures that page is part of
regular testing, and also includes fixes for the issues present.
* fix sidebar contrast
* add some attribtutes to docs template for accessbility
* fix colors to meet accessibility guidelines (4.5 contrast ratio for text)
* Fix last remaining pa11y error (no button on search form)
This fix required moving the mkdocs theme out of the docs directory.
It's no in the docs_theme directory, and the mkdocs config is updated
accordingly.
* Re-enable accessibility testing for docs sit
Also, move the pa11y script into the gh actions workflow
* clean up linting issues in css
* fix and standardize link colors across site
* fix twitter button opacity making text fail contrast requirements
* move buttons on docs site index nav, tweak font weights
* fix footer opacity, tweak spacing of the now more visible sections of the page
* change font sizes on index page to meet WCAG
* udpate font sizes site-wide for accessibility
* fix sidebar for accessibility (font sizes and color contrasts)
* restyle code blocks to have dark background, and meet accessibility requirements
* standardize (accessible) colors across docs site
