refactor: change the server configuration format

[flexiondotorg]

Description

The patch changes the way the Stream Sprout server is configured. I'm making this change before the project gets established as this new technique is easier to validate and provide sane fallback behaviour.

app is added so the Stream Sprout server URLs conform to typical RTMP expectations and FFmpeg no longer generates warnings.

Before

server:
  url: "rtmp://127.0.0.1:1935"
  key: bc102314-9013-4301-8468-9b5592c05201
  archive_stream: true
  archive_path: "${HOME}/Streams"

After

server:
  ip: 127.0.0.1
  port: 1935
  app: sprout
  key: bc102314-9013-4301-8468-9b5592c05201
  archive_stream: true
  archive_path: "${HOME}/Streams"

Type of change

• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Documentation (updates the documentation)

Checklist:

• [x] I have performed a self-review of my code
• [x] I have tested my code in common scenarios and confirmed there are no regressions
• [x] I have added comments to my code, particularly in hard-to-understand sections
• [x] I have made corresponding changes to the documentation