Add config to hide multi user in SDDM

[arenekosreal]

Also use git tag string rather than commit id as version name

[codecov-commenter]

Codecov Report

Merging #22 (9ebf1d0) into master (6171b8f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #22   +/-   ##
=======================================
  Coverage   45.30%   45.30%           
=======================================
  Files          17       17           
  Lines         543      543           
=======================================
  Hits          246      246           
  Misses        208      208           
  Partials       89       89           

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