Crate-docs-theme

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- Fix a typo (character case) in `sidebartoc.html` causing the TOC to not
display for the Cloud How-Tos project

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- Preloading the full star of the rating system to prevent empty stars
- Added a note about ``custom.css`` and ``custom.js``
- Fix sidebar TOC . Previously, Sphinx was not expanding the sidebar TOC for
both how-to projects.

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- Added meta description to index.rst for testing
- Properly aligned footer container with the others
- Changed crate.io logo from png to svg
- Changed to svg stars from characters so all platforms look the same
- Changed menu from fontawesome bars to spans
- Fixed minor regressions from last update (borders, indents)
- Excluded internal links from external link icon
- Removed fontawesome.js

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- SEO: Added `rel="noopener"` to Github links (links to cross-origin
destinations are unsafe)
- Updated/removed Bootstrap and jQuery packages (nine vulnerabilities detected)
- SEO: Added `height: auto;` to the logo css (lighthouse cought a wrong AR)
- SEO: Added alt & title tags to logos in header and footer
- Moved esi to the correct position
- SEO: Added dns-prefech/preconnect to googleapis.com and cdn.crate.io
- Updated version tag for css/js in `base.html` for cleaner caches
- SEO: Added language `xml:lang="en" lang="en"`
- Added Favicon
- SEO: Preloading Font
- SEO: Minified/Combined static js/css files (except custom and doctools)
- SEO: Removed `maximum-scale=1` from meta viewport to allow zooming
- Added new rating feature below the feedbackbox
- SEO: Changed h3 to h2 for feedbackbox and new rating
- Fixed a minor css error in `crateio.css` and added `font-display: swap;`
- Fixed colors of the `Toggle Doc Menu` (mobile)
- Add left-margin to all lists
- Fix paragraph margins for lists using the "open" class

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- Permit installation with more recent versions of Sphinx by relaxing strict
dependency on ``Sphinx==1.8.5``
- Update to ``sphinxcontrib-plantuml==0.19``

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- Added WordPress navi as edge side include via Varnish
- Added bottom margin to code highlights