Updated the docs on how to operate nomad. Now there is a documentation of the...

Updated the docs on how to operate nomad. Now there is a documentation of the CLI (few use cases and command reference) and the whole doctree has been modified for better navigation. Also added a new dev-dependency for sphinx-click that can autogenerate docs for click.
5 jobs for docupdate in 17 minutes and 46 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build #1014263

00:08:22

passed buildgui #1014264

00:03:50

 
  Test
passed linting #1014265

00:02:02

passed tests #1014266

00:09:23

76.0%
 
  Release
manual release #1014267
allowed to fail manual