Change docs license to CC-BY-SA
Having different docs in CE and EE, causes the following problems:
- Merge conflicts in the automatic ce-to-ee merge
- Merge conflicts when you submit an MR to CE (the
ee_compat_checkjob will check it)
- Additional overhead for the tech writing group having to submit two MRs most of the time (since we add more and more features in EE and conflicts are unavoidable)
- Confusion for contributors and team members where to put the docs (people are contributing to EE for CE features)
Going towards a unified codebase, I think we can start at least consolidating the CE and EE docs, meaning they will have the same content. In order to do that, we need to change the license of the docs and particularly use an open one. Also, to avoid the problems stated in the list above.