Add link to source code and privacy policy

Merged Cornelius Schumacher requested to merge cschumac/okular-kde-org:link-gitlab into master

Make it easier to find the sources of Okular and how to contribute. Also add a link to KDE's privacy policy.

This relates to criteria and of the criteria for the Blue Angel for Resource and Energy-Efficient Software Products.

Edited by Cornelius Schumacher

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