Rollup merge of #132794 - WaffleLapkin:helix-improved-config, r=jieyouxu

Use a separate dir for r-a builds consistently in helix config

r? `@jieyouxu`
cc `@mrkajetanp`

Previously config used `build-rust-analyzer` for rustfmt and proc macros server, while not using it for actual `x check` commands.

This PR:
- Replaces the build dir with `build/rust-analyzer`
  - This is just my preference
  - Although I do think this is the nicest option: the directory is already git-ignored, `rm -fr ./build` removes everything, etc
- Uses said directory with the `x check` commands in helix r-a config
- Adds instructions on how to build rustfmt and proc macro server to the config

As of note, this is not what other configs do (like vscode's), however this _is_ what I would actually suggest to people (and what I'm actually using).

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