revert: remove RSS feed feature and feedgen dependency (#1139)
19 hits in 30 days, one of which was the 500 that surfaced this.
Nobody uses it. Removes feeds module, tests, feedgen+lxml deps,
and frontend <link rel="alternate"> tags.
Also fixes cf_analytics.py to use SCRIPT_CF_API_TOKEN env var.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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