[suggestion] Add a link to a help page

[kawazoe]

Since most issues so far have been about support for sites, I thought maybe you could enable the wiki feature in github to act as a help page. I could do a quick PR to link to the wiki from the popup directly.

I wrote an example page on my fork that shows how it could cover those specific support requests: https://github.com/kawazoe/AuRo/wiki/Known-Unsupported-Sites