Update config.yaml

[NavikaAgarwal]

1. Filled Important Empty Fields: Added comments suggesting where to fill important fields like favicon, repo, shortname, etc.
2. Unused Configurations: Kept all necessary comment providers but left fields blank or commented for flexibility.
3. Removed Redundant or Unnecessary Fields: Kept the code clean by removing unnecessary keys, e.g., empty configurations for unused providers.
4. Comments for Clarity: Added helpful comments to guide the next steps.