feat: swap bootstrap for paragon sass

[abutterworth]

Swap Bootstrap SASS for Paragon SASS throughout studio and lms.

Builds off https://github.com/edx/edx-platform/pull/27751 and depends on https://github.com/edx/edx-themes/pull/737.

• Augment the SASS importer to understand the common ~ in imports to mean node_modules/ that Paragon relies upon
• Swap Paragon SASS for Bootstrap anywhere it's used. In some cases this means adding all of Paragon in places where only Bootstrap mixins were used. Paragon doesn't offer pulling mixins, variables, and functions independently from the component css.
• Remove edx-bootstrap from default themes
• Map some missing colors in Paragon to reasonable defaults (inverse -> white, purchase -> success, lightest -> light-300)
• Fixes for some minor layout and color regressions

Key file sizes:

file	prod	https://github.com/edx/edx-platform/pull/27751 + https://github.com/edx/edx-themes/pull/737	This PR + https://github.com/edx/edx-themes/pull/737
lms-course.css	778kb	1.4mb	1.6mb
lms-discussion-bootstrap.css	189kb	210kb	350kb
lms-footer-edx.css	389kb	105kb	841kb
lms-main-v1.css	2.2mb	1.3mb	2.3mb
lms-main.css	1.3mb	371kb	549kb
studio-main-v1.css	1.1mb	2.1mb	2.5mb

[abutterworth]

jenkins run quality

[abutterworth]

jenkins run quality

[edx-status-bot]

Your PR has finished running tests. There were no failures.

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[kdmccormick]

This work has stalled. See #31616.

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