Frontend Inheritance Organization (WIP) - Calendar Responsiveness Bug Fix

[OdeYec]

Encountered a bug in responsiveness that makes the calendar not stretch till the bottom of the browser.
Fixed using some flex/grid magic and changed the scroll listener to be on #calendar-grid instead of the of the whole window.

Also rearranged some files and made better template bases.

Pushing so @aviadamar can continue. Hopefully didn't break anything 🤞

[codecov-io]

Codecov Report

Merging #218 (019aac4) into develop (a39d4d8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #218   +/-   ##
========================================
  Coverage    99.38%   99.38%           
========================================
  Files           37       37           
  Lines         1456     1456           
========================================
  Hits          1447     1447           
  Misses           9        9           

Impacted Files	Coverage Δ
app/routers/calendar.py	100.00% <100.00%> (ø)

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