docs: update links and branch names

[vdelendik]

scan all docs md and reuse final naming for the org/repo. also let's change develop to master or main when merge 2.3 rc PR: https://github.com/zebrunner/community-edition/pull/542

[vdelendik]

done. @okamara - visit https://zebrunner.github.io/community-edition/ doc site and verify that:

1. all pictures are displayed
2. all links works fine pay attention to the references to the github repositories etc

[ghost]

Wrong links on page for Zebrunner Reporting, Jenkins

[ghost]

verified, fixed.