Revert "Always render a GitHub ribbon on the right-hand side (#495)"

[slawekjaranowski]

This reverts commit 183b4a3.

As we need more discussion about it, my proposition is revert now, do release ...

We will have more time for testing and take a decision.

reference:

• Render a GitHub ribbon on all sites #515
• Always render a GitHub ribbon on the right-hand side #495

[kwin]

For me it is not clear why to revert this. IIUC @hboutemy only had concerns with this for non-plugins. Did I miss something?

[hboutemy]

exactly: one step after the other
testing on plugins is ok, no need to revert

[slawekjaranowski]

exactly: one step after the other testing on plugins is ok, no need to revert

great now is also clear