Run Prettier across projects

Problem:
Prettier was not running when I saved Emacs buffers.

Why?
- prettier-js-mode needs needs node; lorri exposes node to direnv; direnv
  exposes node to Emacs; lorri was not working as expected.

Solution:
Now that I'm using nix-buffer, I can properly expose node (and other
dependencies) to my Emacs buffers. Now Prettier is working.

Commentary:
Since prettier hadn't worked for so long, I stopped thinking about it. As such,
I did not include it as a dependency in boilerplate/typescript. I added it
now. I retroactively ran prettier across a few of my frontend projects to unify
the code styling.

I may need to run...
```shell
$ cd ~/briefcase
$ nix-shell
$ npx prettier --list-different "**/*.{js,ts,jsx,tsx,html,css,json}"
```
...to see which files I should have formatted.

website/sandbox/contentful/postcss.config.js

@@ -1,7 +1,5 @@
-const tailwindcss = require('tailwindcss')
+const tailwindcss = require("tailwindcss");
 
 module.exports = {
-  plugins: [
-    tailwindcss('./tailwind.config.js')
-  ]
-}
+  plugins: [tailwindcss("./tailwind.config.js")],
+};