Fix title headings styles
Add paragraph about sessions commands
Fix code blocks
Split content of CLI documentation between sysadmins and developers
Create users command line interface documentation

- Rename command-line interface documentation files
- Modify |OmeroCLI| global substitution
Convert glossary into definition list
Add documentation for user/group CLI functionalities

- Fix heading in sysadmins documentation
Add paragraph about group copy
Improve users CLI documentation readability (add workflow section)

Systematically use the :command: role for CLI commands
Define :omero_cmd: role and apply it to the CLI documentation pages

Turn bash highlighting off
Expand the server configuration section of the CLI documentation

- Fix link to developers CLI page
- Fix location of user profiles
Standardize spelling & abbreviation of the Command Line Interface

- Add global substitution for Command Line Interface abbreviation
- Remove global substitution for CLI doc pages
Use command markup in developers CLI page
Rewrite group management introduction

- Remove duplicate :omerocmd: calls
Remove command descriptions from the developers CLI page
Fix inconsistencies/errors in the documentation
Replace abbreviations by links to the developers CLI page
Fix typo
Fix miscellaneous typos
Update Common markups section in README.rst