Polishing the app

[JakuJ]

Quite a few small changes in this PR:

• bugfix: now it's the right-click that opens menus in the Composer. This fixes the drag-and-click bug.
• docs: Some missing documentation in the Help modal was added (Ctrl+S in the editor, menus in the Composer).
• optimization: response compression has been enabled (Brotli), achieving some nice speedups when it comes to page load time
• optimization: most CSS files load asynchronously
• feature: the menu for adding gates manually has been improved and features 12 intrinsics now

Closes #100
Part of #90

[codecov]

Codecov Report

Merging #102 (95f7e72) into develop (60e4e33) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #102      +/-   ##
===========================================
+ Coverage    95.89%   95.93%   +0.03%     
===========================================
  Files           50       51       +1     
  Lines         1268     1278      +10     
===========================================
+ Hits          1216     1226      +10     
  Misses          52       52              

Flag	Coverage Δ
unittests	95.93% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Explorer/Components/Composer/Cell.razor	100.00% <ø> (ø)
Explorer/Components/Composer/Grids.razor	100.00% <ø> (ø)
Explorer/Components/Modals/HelpModal.razor	100.00% <ø> (ø)
Explorer/Pages/_Host.cshtml	0.00% <ø> (ø)
Explorer/Components/Composer/AddGateMenu.razor	100.00% <100.00%> (ø)
.../Components/Composer/Drawing/GateMeasurement.razor	100.00% <100.00%> (ø)
Explorer/Components/Composer/Gate.razor	100.00% <100.00%> (ø)
Explorer/Components/Composer/Grid.razor	100.00% <100.00%> (ø)

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[skdw]

The app gets loaded so fast now!
Interacting with the Composer has also became much more pleasant 🎉