Regarding price feed's is there a simple setup guide for users to contribute?
I wrote a whitepaper for an old algorithm based smartcoin, it's got some additional insights you might be interested in: https://github.com/BTS-CM/Hertz-Whitepaper/blob/master/hertz_whitepaper.md
Though, otherwise not really, it's the responsibility of the smartcoin owner to coordinate proper price scheduling, you can't just volunteer price feeds for a smartcoin you need to either be on the private price feed publisher list, or be in the committee or be an active witness.
Price feed publishing is also not free, it does cost money over time, which smatcoin owners need to consider when asking people to publish price feeds for them - the publisher could run out of BTS to fund their automated scripts and thus stop feeding if they forget about it, or they could in the long term change their mind if feeding doesn't benefit the DEX or themselves in the long term.
Just because you pick the witnesses, the committee or add people to your feed list, they don't have to price feed, especially if your communication with them is low/poor.
Otherwise, documentation wise we're talking about like the readme's accommodating automated price feeding scripts on github
You can track the price feeding history within the reference wallet, and within block explorers like blocksights or the kabana data analytics page, but no otherwise there's not like a webpage dedicated to monitoring all the price feeds for all smartcoins.