Fix styling

[marikaris]

• Add back button to detail screen
• Fix menu
• Keep title when switching between screens
• Disable tree nodes when no variables are available for the node

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@e4a65b7). Click here to learn what that means. The diff coverage is 76.9%.

@@           Coverage Diff            @@
##             master     #20   +/-   ##
========================================
  Coverage          ?   82.1%           
========================================
  Files             ?      15           
  Lines             ?     179           
  Branches          ?       4           
========================================
  Hits              ?     147           
  Misses            ?      32           
  Partials          ?       0

Impacted Files	Coverage Δ
...mponents/harmonization/HarmonizationComparison.vue	0% <ø> (ø)
src/store/state.js	100% <ø> (ø)
src/components/LifeCycleCatalogue.vue	0% <0%> (ø)
src/store/getters.js	100% <100%> (ø)
src/util/EntityToTreeMapper.js	96.2% <100%> (ø)
src/store/mutations.js	100% <100%> (ø)
src/components/MolgenisMenu.vue	25% <33.3%> (ø)

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