Remove blueprint.js dependency

[jumpinjackie]

Although we use blueprint.js to provide a consistent UI foundation for various widgets/components, its usage does:

a) Bloat up our bundle size
b) Make our [embedding / use as a package] story a bit awkward as we may be consuming this library into an application not based on blueprint.js and our usage of blueprint.js may "infect" or override the application's existing styling.

In practice, our usage of blueprint.js is limited to:

• Buttons
• Styled form inputs
• Slider controls
• Non-ideal state placeholders
• Cards
• Callouts (stylized info/error/warning panels)
• Dialog frames for modals
• Menus
• Toast-style notifications
• Font/SVG icons

Most, if not, all can be replicated "in-house" or with a lower-footprint and un-opinionated, but themeable UI foundation library.

[jumpinjackie]

Radix UI looks to be a decent alternative in terms of what we're using.

A key selling point here is that it is "headless", so it does not impose any pre-defined styling constraints on downstream consumers of this viewer package.