Unify use of hyphens or underscores in file/directory names
Currently, some files and directories in the documentation use hyphens in their names (e.g.
turris-10.jpg) and some of them use underscores (e.g.
mox_cpu_only.png). We should define what to use and then to unify it across the whole documentation.
I would recommend to use hyphens because:
- Underscores can be overlooked easily.
- Web search engines threats underscores as "not so separators". Thus names with hyphens are better indexed.