Update Workflows to requirement specified by the template (#308)

* update workflows

* remove outdated workflow, add main branch and remove duplicate code of conduct

* Remove templates

Co-authored-by: wow-such-code <andreas.friedrich@uni-tuebingen.de>
Co-authored-by: Sven F <sven.fillinger@qbic.uni-tuebingen.de>

Author: 3 people

.generate-reports.py

@@ -13,10 +13,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [ master, development, patch/*, release/*, hotfix/* ]
+    branches: [ main, master, development, release/*, hotfix/* ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ main, master ]
   schedule:
     - cron: '21 1 * * 4'