fix(wpcarro/emacs): Update rust configuration

- Prefer LSP to racer
- Move KBDs to central location

Change-Id: Ib3fbf1b383d711f3ac6dd6d7791374b014b9df90
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6054
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/emacs/default.nix

@@ -11,6 +11,15 @@ let
 
   emacsBinPath = makeBinPath (
     wpcarro.common.shell-utils ++
+    # Rust dependencies
+    (with pkgs; [
+      cargo
+      rls
+      rust-analyzer
+      rustc
+      rustfmt
+    ]) ++
+    # Misc dependencies
     (with pkgs; [
       ispell
       nix
@@ -85,7 +94,6 @@ let
       direnv
       alert
       nix-mode
-      racer
       rust-mode
       rainbow-delimiters
       racket-mode