Add Schema.org Dataset or DataFeed structured info for each dataset item

[thadguidry]

Proposal

Given: https://academictorrents.com/browse.php?search=wikidata&c6=1

Enhanced search for consumers could be facilitated by Search engines themselves if they understood the content of AcademicTorrents a bit better.
One way to do that is to simply add a Schema.org Type of Dataset for each dataset item, as well as to the search results while browsing.
Alternatively, each AT dataset could be a dataFeedElement within a DataFeed.

Additional Context

https://schema.org/Dataset
and a more specific type than Dataset is https://schema.org/DataFeed

I am happy to volunteer to help code this enhancement, we would just need to get some consensus on which Type makes the most sense.

[thadguidry]

Since @ieee8023 stated already in #27 (comment) that:

Hmm, we have an RSS feed for all new public data https://academictorrents.com/rss.xml and also a feed for every public torrent with the title of the entry that you could filter: https://academictorrents.com/database.xml

We can probably just close this as "not needed".