Put on the page a handy link to file a GH issue

[tripu]

We display now this notice at the top of the page:

“W3C is teaming up with Jefferson University to improve the design of the specification template.”

Once we remove that, it would be good to have a link somewhere on the page instructing users about how to send feedback or report bugs. We could provide a preformatted template that even sets the right label (click on the link below to see it in action).

This does not need to be at the top of the page necessarily.

Something like:

“See bugs on this page? Have suggestions to make? — Report on GitHub, please”