mkdir.nvim, nix-develop.nvim, direnv.vim: init, blink-cmp: add source options, friendly-snippets source

[alfarelcynthesis]

Adds a few very simple plugins I use, as well as options for blink-cmp that I find useful.

I can split this into a couple PRs if that would be preferred.

• mkdir.nvim
• nix-develop.nvim
• direnv.vim

Two blink-cmp options:

• blink-cmp.sourcePlugins, for arbitrary blink-cmp completion sources
  • there is a three provided sources that I've tested, that are disabled by default.
    I'm not sure how to indicate in the docs that they are present without making them
    disappear as soon as any other sources are added.
• blink-cmp.friendly-snippets.enable, for an alternate snippet source
  • friendly-snippets is automatically detected by blink-cmp, so it doesn't need the same
    handling as other options

I also snuck in some typo fixing in the release notes (in a separate commit).

Sanity Checking

• I have updated the changelog as per my changes
• I have tested, and self-reviewed my code
• My changes fit guidelines found in hacking nvf
• Style and consistency
  • I ran Alejandra to format my code (nix fmt)
  • My code conforms to the editorconfig configuration of the project
  • My changes are consistent with the rest of the codebase
• If new changes are particularly complex:
  • My code includes comments in particularly complex areas
  • I have added a section in the manual
  • (For breaking changes) I have included a migration guide
• Package(s) built:
  • .#nix (default package)
  • .#maximal
  • .#docs-html (manual, must build)
  • .#docs-linkcheck (optional, please build if adding links)
• Tested on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin

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Debug Information

Triggered by: alfarelcynthesis

HEAD at: extra-plugins

Reruns: 319

[NotAShelf]

LGTM.

CC @horriblename for blink-cmp side of things.

[alfarelcynthesis]

Some blink options moved around when it was updated so I'm not sure if this will work correctly if merged right now (as blink itself does not work on main, so I can't test how it will behave with the newer version once blink is fixed).

If no one else gets to it for a few days I might try and fix it.
It should essentially be moving cmdline completion options to a separate attrset instead of inside keymap and sources, and adding a new attrset for terminal completion settings.

[NotAShelf]

53d0e79 should fix blink on main, although I don't quite have it set up so I had to push the change with a quick dev configuration instead of an actual configuration.

[alfarelcynthesis]

I'll give it a try on my end, hopefully will still work/just require most recent blink-ripgrep-nvim instead of the version I used.

[alfarelcynthesis]

Works as expected, did still update blink-ripgrep.nvim as it works with the version of blink.cmp we have now (as well as rebasing on newest main).