Add support for websites with known feed links lacking auto-discovery

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Platforms such as WordPress, Medium, Tumblr, YouTube, Blogger etc have predictable feed urls even if they aren’t publishing the auto discovery links in the head section.

See: https://perishablepress.com/what-is-my-wordpress-feed-url/ https://zapier.com/blog/how-to-find-rss-feed-url/

For other websites that publish pages with links of feeds without auto-discovery it’s a little more of a pain. Perhaps we can crawl these and generate a database?

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GitHub: https://www.ronaldsvilcins.com/2020/03/26/rss-feeds-for-your-github-releases-tags-and-activity/

Private feed support is going to be an issue if we offload to cfw.

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More examples: https://www.apple.com/ca/rss/ https://www.bbc.co.uk/news/10628494 https://www.cnn.com/services/rss/