Revert "Add regional RSS feeds for South America, India, and Australia"🇦🇺

[deontewatts]

Summary

Describe what changed.

Why

Explain the problem being solved.

Scope

• Focused bug fix
• Small UX improvement
• New source
• Dashboard change
• Docs/config change

Validation

List the commands, checks, or manual validation you performed.

Screenshots

If the dashboard or any visible output changed, add screenshots.

Config and Docs

• No new environment variables
• .env.example updated if needed
• README.md updated if behavior changed

Source Additions

If this PR adds a new source, explain:

• why the source improves signal quality
• whether it requires an API key
• how it degrades when the key is missing
• what changed in apis/briefing.mjs and dashboard/inject.mjs

Checklist

• This PR stays within one bugfix or one feature family
• I kept unrelated changes out of the diff
• I considered security for any mixed-source content rendering
• I tested the changed path locally