Update Readme.md

Remove old section named Github! Change to Collaboration
patch for http proxy setting
Merge branch 'http-proxy-for-facets' into release/0.1
Merge remote-tracking branch 'origin/release/0.1'
Merge branch 'master' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next into DDBNEXT-25

Conflicts:
	grails-app/services/de/ddb/next/Facets.groovy