9267: fix: Code: update the LSP server without asking r=matklad a=lnicola
Most LSP extensions seem to do the same thing, and this is causing some
confusion for users who don't notice the update prompt before Code hides
it.
9279: minor: Document installation via Homebrew r=matklad a=Svetlitski
`rust-analyzer` can be installed via [Homebrew](https://brew.sh) (AKA`brew`) on macOS. I've added instructions on how to do so to the documentation. Additionally, I added a `.gitignore` rule to ignore the HTML documentation produced by `asciidoctor manual.adoc` so that it is not accidentally checked into `git`.
Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
Co-authored-by: Kevin Svetlitski <kevin_svetlitski@berkeley.edu>
Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
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