Hints for fonts-hack in main

Warnings

• asv-cid-is-not-rdns
  fonts-hack.metainfo.xml:3 - fonts-hack
  The component ID is required to follow a reverse domain-name scheme for its name. See the AppStream specification for details.
• asv-update-contact-no-mail
  fonts-hack.metainfo.xml:29 -
  The update-contact does not appear to be a valid email address (escaping of `@` is only allowed as `_at_` or `_AT_`).
• asv-tag-empty
  fonts-hack.metainfo.xml:29 - update_contact
  The mentioned tag is empty, which is highly likely not intended as it should have content.
• asv-font-no-font-data
  fonts-hack.metainfo.xml -
  Type `font` component, but no font information was provided via a `provides/font` tag.