Without this commit, I get this error:
> Unable to find template "common/.githooks/prepare-commit-msg.twig"
(looked into:
phar:///home/opdavies/Code/personal/build-configs/nix-derivation/dist/build-configs/templates).
I don't know why this isn't added by the `templates` value that's
already there, but adding `templates/common/.githooks` explicitly fixes
the error when running the `app:generate` command.