Added basic UI shell

[rgaudin]

• Bootstrap 5 style
• FontAwesome for icons
• Header with logo and menu
• Loading spinner on top of logo
• Vue router with history
• Vuex store
• About/Support page
• Constants module with backend URL
• Common mixin with helpers

[codecov[bot]]

Codecov Report

Merging #34 (9c30908) into main (eaec6ae) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           29        29           
=========================================
  Hits            29        29           

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