Proxy concept extended uj
- Introduced+modified SP IdP proxy concept page
- based on MR132
- built page of MR132
- diffs of the two page versions
- will also be merged to that one first and then to master
Reviewers: @sa.apweiler @andreasfk @marcus @matthias.bonn
Edited by Uwe Jandt (DESY, HIFIS)