* Refactor: Load UserTemplates from embedded yaml file
* feat: add version field to UserTemplates
* refactor: use shell script to fetch frontends
* chore: add *-dist to .gitignore
* refactor: rename to FrontendTemplates
BREAKING CHANGE: This commit changes the `user_templates` filed
in the communication json between backend and the admin-frontend.
Keep user config.yml `user_template` filed.
