Upgrade to Docsy 0.5.1 via NPM module

[chalin]

• Fixes Upgrade to Docsy 0.5.1 #48807
• Contributes to:
  • Align with upstream Docsy #41171
  • Should update theme/docsy step by step to the latest docsy  #44002
• Upgrades to Docsy 0.5.1 as an NPM module.
  • Fetches FontAwesome and Bootstrap via NPM, so I believe (if I understand the intent) that this
    fixes Bootstrap and Font Awesome (as part of Docsy) are deprecated #32905
  • Upgrades FontAwesome to v6, and so upgrades all icon names, and so
    fixes Use canonical FontAwesome v6 icon names, upgrading from v3-v5 #48811
• Drops the git submodule reference to Docsy 0.3.0
• Ensures that container commands continue to work
• Updates the makefile
• Switches to using template "partials/page-description.html" to generate HTML header page meta descriptions. (This template has continued to be improved, with the most recent update being made in Docsy 0.11.0.)
• Drops the static Bootstrap resources, keeping the one needed by the API pages.

Also addresses and closes the following:

• Fixes There are two <script> elements referencing jQuery #48806

  $ curl -s https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/ | tr '<' '\n' | grep -i '^script' | grep -i 'jquery' 
  script src="/js/jquery-3.6.0.min.js" intregrity="sha384-vtXRMe3mGCbOeY7l30aIg8H9p3GdeSe4IFlP6G8JMa7o7lXvnz3GFKzPxzJdPfGK" crossorigin="anonymous">

• Fixes [style] Named code-block elements show unnecessary block padding #48808
• Fixes Tab panes have formatting issues #48813

Previews

• https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/ - e.g., check the footer
• https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/docs/concepts/windows/ for the page-meta icons, including the 3rd-party one
• https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/docs/concepts/configuration/configmap/#using-configmaps-as-environment-variables - for code-blocks, including named ones with a copy-code button, as well as tooltips
• https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/docs/tasks/tools/install-kubectl-linux/#install-kubectl-binary-with-curl-on-linux for tabbed panes, e.g.:

  

• https://deploy-preview-48812--kubernetes-io-main-staging.netlify.app/docs/contribute/docs/#getting-started for Mermaid diagrams

Checks I've done

I've checked that the following render correctly, feel free to double check:

• Icons (now that we're using FA v6) render properly in the
  • Footer
  • Doc pages, page-meta-links section
  • Blog pages, page-meta and other links
  • More rarely used icons like the third-party icon (in page-meta), for example see Concepts > Windows
• Mermaid diagrams continue to render correctly
• Tooltips are still working, demonstrating that the new way to fetch and use Bootstrap CSS and JS is working
• Code-blocks and figures render correctly

Followup changes

This PR makes minimal changes. Consider following up with updates to:

• API reference generation code to catch up to the FontAwesome & Bootstrap versions now used by the rest of the website (via Docsy).
• Dockerfile, to switch to docker.io/library/debian:bookworm as @sftim proposed in Bump Docsy to 0.4.x #48722
• [UX] Consider switching to use of Docsy tabpane, since they persist settings for readers #48814
• Btw, stylistically, I think that we should drop the border on the .mermaid class

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