This PR comes with a bunch of improvements to our template generation
script that makes it safer and more reliable
- bumps all our templates
- Using `latest` as payload version in our templates has proven to be
unreliable. This updates the gen-templates script to pin all payload
packages to the latest version
- adds the missing `website` entry for our template variations, thus
ensuring its lockfile gets updated
- adds importmap generation to the gen-templates script
- adds new `script:gen-templates:build` script to verify that all
templates still build correctly