Add feed back link to website that encourages opening tickets on github

[riedel]

Dashboard was broken, but no issue was filed

[limond]

I added a second footer with links to legal disclosures and a wiki page which explains how to report an issue. The link is likely hard to find. Another option would be a button at the side of the page. This was my first idea. However, it might be too obtrusive.

[buddemat]

I think you are correct: it is too hard to find.

[PTremper]

Only people with github accounts can give us feedback on the website since you need a github account to open an issue there.
I would suggest that we add an email adress on the github wiki side, which the "report an issue" button links to, which directs emails to a shared folder. Like the aqnet@teco one. Can add a sentence like "If you do not have a github account, you can write us an email to..."