update sidebar for notebook

[WizardMode]

This sidebar contains the following.

• displays user and current notebook
• displays current notebook version
• contains a version control dropdown menu
• contains share module
• display a list of avatars, for current collaborators

all of the above, are functional.

[codecov[bot]]

Codecov Report

Merging #167 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #167   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         1329      1329           
=========================================
  Hits          1329      1329           

Flag	Coverage Δ
#unittests	100.00% <ø> (ø)

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