Allow Custom Notes to Contain Hyperlinks

The custom notes for all character sheet elements should be able to hold hyperlinks to source sections at least, if not also to external sites. Alternatively, add let Headings or other UI elements to link to source sections.

Example: I want my Alchemist's Supplies to link to https://www.dndbeyond.com/sources/xgte/dungeon-masters-tools#AlchemistsSupplies somehow.