bring hub up to public assembly hub standards

[diekhans]

https://genome.ucsc.edu/goldenPath/help/publicHubGuidelines.html

and register as a public hub

[diekhans]

The empty track description template is here:

https://raw.githubusercontent.com/diekhans/T2T-CHM13-hub/master/templates/trackDescriptionTmpl.bare.html

The display conventions can mostly be lifted from similar tracks

[diekhans]

a filled-out example for CAT in CHM13 is:

https://github.com/ucscGenomeBrowser/kent/blob/master/src/hg/makeDb/trackDb/human/hs1/html/catLiftOffGenesV1.html