chore: Changes to support static frontmatter in docs

[nzakas]

Updated website templates to us the static frontmatter in the docs files (eslint/eslint#15782).

Changes include:

• Updating all docs files to appropriate format
• Updating doc.liquid to show titles from frontmatter (fall back to older way for versioned URLs such as /docs/7.0.0)
• Added a filter to match a string to a regex

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[mdjermanovic]

This text is generated by Makefile.js. If we remove it here, it will be lost.

https://deploy-preview-933--eslint.netlify.app/docs/rules/array-bracket-newline

(the same for recommended and suggestions).

[mdjermanovic]

If the goal is to generate this text during the website build, we should add to this repo some code that generates it.

[nzakas]

This should be generated by gensite in the ESLint repo. You already identified the bug there that caused this.

[mdjermanovic]

If we want to add docs/developer-guide/architecture/index.md, we should remove docs/developer-guide/architecture.md file in this repository to allow access to https://eslint.org/docs/developer-guide/architecture/

(when there's a foo/bar.html file, Netlify redirects foo/bar/ to foo/bar even if foo/bar/index.html exists).

Step 2 in Makefile.js is actually not removing anything from the website. It looks like it expects a list of files, but gets a list of directories.

[nzakas]

If we want to add docs/developer-guide/architecture/index.md, we should remove docs/developer-guide/architecture.md file in this repository

Could have sworn I did that but maybe didn’t make it into the last commit.

[nzakas]

It looks like the website is now dependent on Makefile.js not removing old files (I tried fixing it but it introduced a bunch of errors due to files that live in website but aren't present in eslint). So, we should just leave that as-is until the new docs site is up and running, at which point we can remove all of that logic.

[mdjermanovic]

LGTM, thanks!