Check API clients

[ralf401]

• Get in touch with maintainers of external API clients
  • Python Python Client
  • .NET System.Text.Json
  • .NET Newtonsoft.Json => no contact details, unmaintained
  • Android API-Client
  • Go Client
  • Go Client fork
• Ask if they face issues or if we can help
• Check for new clients
• Remove long-time unmaintained clients with no contact to maintainers
• Establish a regular check

[ralf401]

• Contacted 5 maintainer (see above)
• Added one Go client
• Removed the deprecated .NET client from docs (no contact details to maintainer anyway)
• Slightly adjusted the wording and structure at the top of the page
• Created a reminder to check this topic again

[mgruner]

👏