Remove NonFreeNet

[niccokunzmann]

Fdroid has the NonFreeNet antifeature.

• Add the URL to na-ovoce.cz as a configuration option in the settings
  • [x] for upload #275
  • [x] for download #277
• [ ] openstreetmap for rendering OpenStreetMap
• [ ] World Imagery for rendering a satellite map
• [ ] staticmap for fetching the map preview
• [ ] www.quelltext.eu - http proxy
  • we can use a proxy as defined by https://github.com/square/okhttp/issues/2525
• [ ] to remove the feature from the metadata.

Related:

• https://fdroid.gitlab.io/fdroid-website/docs/Build_Metadata_Reference/

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