Add 'Fork Me On GitHub' ribbons

[ghost]

Since the Coala Community site is Open Source, I think it'd be a good idea to encourage contributions to it by adding a 'Fork Me On GitHub' ribbon to each page!

The ribbon, which could look something close to these would take the viewer to https://github.com/coala/community/fork where they'll be prompted to fork the repository and make changes :) I think it's important to have this as the site is about the community around Coala and GCI, both of which are founded around Open Source contributions 😄

Examples of ribbons/links like this are often found on stuff like the Docsify Site and the Jekyll Documentation.

[jayvdb]

We should get the views built as templates before doing this one.

[Dragneel7]

@ItsPugle Is this issue open to work on?

[ghost]

Yep, @Dragneel7! It'd be a good idea to wait for what @jayvdb said :)

[jayvdb]

This issue is in status/blocked, but if you are a GCI student we have a similar task over at https://codein.withgoogle.com/dashboard/tasks/5422018000322560/

[blazeu]

We have similar blockage as well coala/gci-leaders#21
It's ok if you do it now, but you'll lose git blame ownership.

[Dragneel7]

I misunderstood the GCI label. I am a university student so I guess I wont be able to work on it.

[ashwini0529]

#45 introduces templates and restructures site.

[nemani]

We can consider using http://tholman.com/github-corners/ looks cuter.

[jayvdb]

This is GCI task https://codein.withgoogle.com/dashboard/tasks/5944249070649344/