NXCALS-1726 Initial structure for Mk Docs pages
#Merge request template @acc-logging-team - please have a look for approval.
The provided mechanism will generate pages on https://nxcals-docs.web.cern.ch/ site from docs directory when code is pushed into develop branch.
Please note that this merge request does not contain a documentation itself (just few examples).
For the authoring of the MkDocs pages the best is to install them locally:
pip install mkdocs
or for Mac OSX
brew install mkdocs
From the docs directory execute: mkdocs serve which will start webserver on http://127.0.0.1:8000
Closes NXCALS-1726