Hints for vocal in main

Warnings

• asv-desktop-app-launchable-missing
  com.github.needleandthread.vocal.appdata.xml -
  This `desktop-application` component is missing a `desktop-id` launchable tag. This means that this application can not be launched and has no association with its desktop-entry file. It also means no icon data or category information from the desktop-entry file will be available, which will result in this application being ignored entirely.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot1.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot2.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot3.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot4.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot5.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://github.com/needle-and-thread/vocal/raw/master/screenshot6.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.