Custom Fabricator UI

[tylersticka]

This PR modifies the Fabricator-specific assets, templates and partials to address both presentational needs as well as our team's technical best practices regarding HTML and CSS.

Before:

After:

This PR does not include:

• Global toggling (this is commented out but will be added back later via keyboard shortcuts)
• Actual "external link" functionality (controls are visible but non-functional)
• Material statuses ("in progress," etc.)

These features would be addressed via separate PRs.

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@erikjung @lyzadanger @saralohr @nicolemors

[erikjung]

Added a few nits about naming things. I also realized that I had never considered how utility classes would fit in with the name-spacing.

[erikjung]

Looks good! :+1: