Explore replacing jQuery with Cash

[dancormier]

jQuery works but I figured Stacks would be a good, isolated environment to explore replacing it with Cash and saving a few KBs (see the comparison chart and [email protected]/[email protected]) sizes.

Worth noting

• This PR ditches much of the navigation functionality (see https://github.com/StackExchange/Stacks/pull/905/commits/fc04f40c64881d3fc0d918e922986528e86816cb). It didn't seem necessary, but there's totally a chance I'm completely overlooking the need. We can add it back but we'll need to extend Cash or add some more vanilla JS.
• Cash doesn't include queue/dequeue methods, so we'll need to find a replacement for toast docs functionality.
• We could import Cash on a per-file basis instead of adding it globally, but I opted for a light-touch in this PR.

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[b-kelly]

Hear me out on this one - what if we just dropped jquery entirely? We don't have that much JS using it.

[aaronshekey]

what if we just dropped jquery entirely

Better get crackin' 🥰😇

[dancormier]

Hear me out on this one - what if we just dropped jquery entirely? We don't have that much JS using it.

The thought crossed my mind. I figured this was a less risky stopgap for now that would help ~~kick the can down the road~~ save a few KBs. That said, if we dropped jQuery, I wouldn't shed a tear.