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.

1 files changed, 7 insertions, 4 deletions

diff --git a/website/sandbox/contentful/src/App.tsx b/website/sandbox/contentful/src/App.tsx
index 6342bfc98dd6..288f03321804 100644
--- a/website/sandbox/contentful/src/App.tsx
+++ b/website/sandbox/contentful/src/App.tsx
@@ -8,7 +8,7 @@ import type { Book } from "./store";
 
 const App: React.FC = () => {
   const dispatch = useDispatch();
-  const { isLoading, books } = useTypedSelector(state => ({
+  const { isLoading, books } = useTypedSelector((state) => ({
     isLoading: state.isLoading,
     books: state.books,
   }));
@@ -16,7 +16,7 @@ const App: React.FC = () => {
   useEffect(() => {
     async function fetchData() {
       const entries = await getClient().getEntries();
-      const books = entries.items.map(x => x.fields) as Book[];
+      const books = entries.items.map((x) => x.fields) as Book[];
 
       dispatch(actions.setBooks(books));
     }
@@ -30,9 +30,12 @@ const App: React.FC = () => {
           <div className="container mx-auto">
             <h1 className="py-6 text-2xl">Books</h1>
             <ul>
-              {books.map(book => (
+              {books.map((book) => (
                 <li key={book.title} className="py-3">
-                  <p><span className="font-bold pr-3">{book.title}</span><span className="text-gray-600">{book.author}</span></p>
+                  <p>
+                    <span className="font-bold pr-3">{book.title}</span>
+                    <span className="text-gray-600">{book.author}</span>
+                  </p>
                 </li>
               ))}
             </ul>