Ability to detect HubSpot Documentation page and inject additional information

[TheWebTech]

Been wanting to update some of their docs for them to include some missing information.

I think the extension would be an interesting solution, I would make any edits that are applied have a visually distinct way of displaying so there would be no confusion what was added by the extension.

However this gets built I would want it to be kind of a framework - a way we can easily update and add to it with consistency.