Hyperlink adjustments

[VladimirAlexiev]

https://raw.githubusercontent.com/edmondchuc/ontogram/main/examples/tern-org.ttl.txt.svg shows hyperlinks that go to the semantic URL of each term.
That's a great idea that I also hope to implement in my tool: VladimirAlexiev/rdf2rml#16

But I think two adjustments are needed:

• rdf:type values also need hyperlinks
• the blue and underline are imho too obtrusive and distracting. If every term has a hyperlink, there's no need to show them

See https://plantuml.com/link#950c6270a3078b08 :

skinparam HyperlinkColor black
skinparam HyperlinkUnderline false