Support for HTML comment tag on wiki
Created by: eelcocramer
Hi,
I use plantuml to create UML diagrams that I want to use on the wiki. I would like to keep the plantuml source inline of the markdown of the wiki page but do not want the plantuml code shown when someone is visiting that page. For this I'm using the following code:

<!---
@startuml{img/test.png}
Bob->Alice : hello
@end
--->
When I let plantuml process the markdown file it will generate the images accordingly.
After I load this page up in gollum I see the generated image and gollum hides the HTML comment for me but when I push the wiki to gitlab and visit the page on the gitlab wiki the HTML comments are displayed on the page.
Having the possibility to add some comments to the markdown file seems useable to me. Can this be added to the gitlab wiki renderer?