Fix dropdown alignment

[bitbound]

So far, I've only used the Bootstrap CSS and left out the JS, using Razor/C# for the interactive elements that didn't work with just CSS.

The dropdown component needs Popper.js for alignment options to work (which is part of the JS bundle), and I didn't want to spend the time implementing a workaround. So I brought in the JS bundle to get the dropdown working correctly.

I also reworked the modal component to use JS, so there weren't any conflicts with JS and the Razor template changes.

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