Hints for nheko in main

Warnings

• asv-web-url-expected
  nheko.appdata.xml:93 -
  A web URL was expected for this value.
• asv-type-property-required
  nheko.appdata.xml:15 - translation ()
  This tag requires a type property.
• asv-tag-empty
  nheko.appdata.xml:15 - translation
  The mentioned tag is empty, which is highly likely not intended as it should have content.
• asv-cid-desktopapp-is-not-rdns
  nheko.appdata.xml:4 - nheko.desktop
  The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.