Add pre-commit hook to run generate-table-of-contents and format scripts

[leroykorterink]

We should run the generate-table-of-contents and format script so that the files in this repository are automatically updated and formatted to avoid conflicts and keep consistency.

We can use husky to implement this.

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

npm run generate-table-of-contents
npm run format