RSS: Fix URLs to point to the correct feed and page
All these URLs:

- https://nitter.catsarch.com/brooke2valley/rss
- https://nitter.catsarch.com/brooke2valley/with_replies/rss
- https://nitter.catsarch.com/brooke2valley/media/rss
- https://nitter.catsarch.com/brooke2valley/search/rss?f=tweets&f-images=on&e-nativeretweets=on

have the same `atom:link` and `link` tags (`<atom:link href="https://nitter.catsarch.com/brooke2valley/rss" rel="self" type="application/rss+xml" />` and `<link>https://nitter.catsarch.com/brooke2valley</link>`).

Additionally, the search RSS feed (for example, https://nitter.catsarch.com/search/rss?f=tweets&q=test) doesn't have  query parameters for its `atom:link` and `link` tags.

I'd expect them to point to the same RSS feed and the corresponding web page respectively, instead of the user's normal list of tweets. For example, `/brooke2valley/media/rss` would have `<atom:link href="https://nitter.catsarch.com/brooke2valley/media/rss" rel="self" type="application/rss+xml" />` and `<link>https://nitter.catsarch.com/brooke2valley/media</link>`.