doc: styling: add filetypes

[bandithedoge]

Styling guidelines for file managers.

The color choices are inspired by base16-vivid, tinted-yazi and some of my old configs. I'd love to see some suggestions.

Will follow up with more PRs to make existing modules compliant.

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• I certify that I have the right to submit this contribution under the MIT license
• Commit messages adhere to Stylix commit conventions
• Theming changes adhere to the Stylix style guide
• Changes have been tested locally
• Changes have been tested in testbeds
• Each commit in this PR is suitable for backport to the current stable branch

[trueNAHO]

Will follow up with more PRs to make existing modules compliant.

Thanks a lot for working on this.

The color choices are inspired by base16-vivid, tinted-yazi and some of my old configs. I'd love to see some suggestions.

It is hard to really gauge the quality of these colors without visual validation. If you would apply this style guide to existing modules in this PR in a separate commit, it would be much easier to validate.

[bandithedoge]

I've applied the new rules to the Yazi module. Is there some simple way to make it quickly display a bunch of files that match the theme rules?

[trueNAHO]

I've applied the new rules to the Yazi module.

I suppose this is not the only module affected by this.

Is there some simple way to make it quickly display a bunch of files that match the theme rules?

Aside from what commit ceda12a ("flake: add Flake Parts tree into testbed environment (#1642)") provides, there is no further internal setup. If you want to implement that for yazi, do that also in a separate commit.

[trueNAHO]

Although this reverts commit a6cf775 ("yazi: allow to set boldness of directory (#1696)"), this is fine if we agree on the proposed specification.

[bandithedoge]

I suppose this is not the only module affected by this.

I know, I only changed Yazi for now to have a visual example of the new guidelines. Once we agree on the colors, I'll implement this for other modules.