Rostislav Vítek

#### Description, the reason for the PR ... #### Fixes issues ... #### Check the appropriate checkboxes below, please - [ ] [BC breaks](https://docs.shopsys.com/en/latest/contributing/backward-compatibility-promise/) - [ ] New feature -...

There are links to files in our documentation that lead to `master` branch which is not maintained anymore. We should update the links to the current major branch and possibly...