HTML Runes can still be made as long as you are able to get into the House with an HTML sign. I have hundreds of these runes (mostly copies). With that said, you can no longer make HTML House signs (that i know of). I think they are a cool Part of history and will continue to grow in value as more and more HTML Houses go IDOC.
That Particular rune was from Heaven of the HOT Guild on ATL. I believe she has a memorial dedicated to her in Fel in the hot guild neighborhood (west of minoc east of yew, Below ice dungeon)
Side note. You can still make HTML book Titles and other misc objects in game.