Remove jQuery dependency

[ryanmitchell]

Remake all of the JS in Vanilla javascript to remove the jQuery dependency. Will affect admin, theme and extensions, but will make the JS leaner and allow for different theme options.

Some helpful libraries:

Select2 replacement: https://bluzky.github.io/nice-select2/
Datepicker/range replacement: https://github.com/mymth/vanillajs-datepicker
Sortable: https://github.com/lukasoppermann/html5sortable

[YnievesDotNet]

Is good idea pass to bootstrap 5 the orange theme.

[ryanmitchell]

Is good idea pass to bootstrap 5 the orange theme.
Do you mean use bootstrap 5 instead of 4?

[sampoyigi]

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