feat(nvim): set up rust lsp config

dots/.config/nvim/after/plugin/lspconfig.lua

@@ -67,6 +67,7 @@ local servers = {
   -- marksman = {},
   nixd = {},
   pyright = {},
+  rust_analyzer = {},
   -- tsserver = {},
   svelte = {
     plugin = {

dots/.config/nvim/flake.nix

@@ -71,6 +71,7 @@
               nixd
               nixfmt
               prettierd
+              rust-analyzer-unwrapped
               shellcheck-minimal
               stylua
               vscode-langservers-extracted