feat: format *.mjs with prettier

TASKS.md

@@ -1,6 +1,4 @@
 # Tasks
 
 - [ ] Need to exclude the generated files from Prettier
-- [ ] Include the C# editor config setup
 - [ ] Add .direnv into `.gitignore`
-- [ ] Add `*.mjs` to Prettier

src/configs/treefmt.nix

@@ -18,6 +18,7 @@ let
           "*.jsx"
           "*.md"
           "*.mdx"
+          "*.mjs"
           "*.scss"
           "*.ts"
           "*.yaml"