plugins/codeium-nvim: move to plulgins/completion

Author: khaneliman

plugins/completion/cmp/sources/default.nix

@@ -193,7 +193,6 @@ in
 {
   # For extra cmp plugins
   imports = [
-    ./codeium-nvim.nix
     ./copilot-cmp.nix
     ./cmp-ai.nix
     ./cmp-fish.nix

plugins/completion/cmp/sources/codeium-nvim.nix renamed to plugins/completion/codeium-nvim.nix

@@ -31,6 +31,7 @@
     ./colorschemes/vscode.nix
 
     ./completion/codeium-vim.nix
+    ./completion/codeium-nvim.nix
     ./completion/copilot-lua.nix
     ./completion/copilot-vim.nix
     ./completion/coq.nix