host a dataset of confirmed introns #2521

we have 2 intron datasets from Danny Bitton
https://www.pombase.org/jbrowse/?loc=II%3A910722..926722&tracks=Forward%20strand%20features%2CReverse%20strand%20features&tracklist=1&nav=1&overview=1&highlight=

But presumably, there is also a dataset of all known introns, too?
we should host this to get a more complete set...

Originally posted by @ValWood in #1338