Add a page for setting up LSP

[srid]

@roberth recommends nixd

Here's what it takes to enable it on haskell-template,
srid/haskell-template#133

[srid]

Test this out:

https://github.com/nix-community/nixd/blob/main/nixd/docs/configuration.md#default-configuration--who-needs-configuration

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I think we need nix-community/home-manager#4031

so as to be able to:

https://github.com/juspay/nix-dev-home/blob/13f9f6daa19607d0e782a3056deb055208519cd5/home/default.nix#L12-L14

[srid]

Some screenshots: https://x.com/sridca/status/1791259775965053321