Added alejandra for formatting

Formatted all files in repo and set up alejandra to run automatically
when nix files are saved.

config/plugins/lsp.nix

@@ -1,4 +1,4 @@
-{
+{pkgs, ...}: {
   plugins.lsp = {
     enable = true;
     servers = {
@@ -19,7 +19,13 @@
       ocamllsp.enable = true;
 
       # nix
-      nixd.enable = true;
+      nixd = {
+        enable = true;
+        settings.formatting.command = ["${pkgs.alejandra}/bin/alejandra"];
+      };
     };
   };
+
+  plugins.lsp-format.enable = true;
+  plugins.lsp-lines.enable = true;
 }

config/plugins/lualine.nix

@@ -7,7 +7,7 @@
     };
     "sectionSeparators" = {
       right = "";
-      left= "";
+      left = "";
     };
   };
 }