Archive SSO repository

Once the following is merged, this repository can be archived:

• dashboard-backend!66 (merged)
• dashboard!23 (merged)
• stackspin!946 (merged)
• %0.8.2 is released and merged into v0.8

Other todo's:

• Move all issues that are still relevant out of this repository
• Move relevant documentation to Stackspin and/or dashboard-backend repository
• Decide what to do with #114 (closed)