docs: add repo url to config

mkdocs.yml

 site_name: Unified Ticketing Doku
 
 repo_name: 'Unified Ticketing Java Bibliothek'
-repo_url: 'http://#'
-edit_uri: ''
+repo_url: 'https://transfer.hft-stuttgart.de/gitlab/9Lukas5/unified-ticketing'
+edit_uri: 'blob/master/docs/'
 docs_dir: docs
 
 use_directory_urls: false