Add file-a-bug and edit-this-page links

[nottrobin]

In either the left or right sidebar, or in the footer, there should be links to file a bug and edit ths page, which take you to github. Is there a way to include the page you came from in the issue description? I think there should be...

[pmahnke]

resin.io does this nicely... well, I like the words, the link and button aren't quite right...

[tbille]

We are moving to discourse docs format. This issue won't be relevant anymore.