RSS reader

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- removed youtube RSS support, instead of subscribing to "YT Cody's Lab" user now must type entire feed url. e.g.
"https://www.youtube.com/feeds/videos.xml?channel_id=UCu6mSoMNzHQiBIOCkHUa2Aw"
- removed all youtube chanels from initial set of sample channels for new users who just installed RSS reader for the first time
- removed spam protection for youtube feeds
- removed custom button