refactor: use @font-face import for mono font

[TylerAPfledderer]

Description

Moves the file for the IBM Plex Mono font to the public folder, and import via @font-face.

This matches the strategy for the Inter font

Fixes issue where mono font was not loading into Storybook.

Related Issue

Issue in Storybook exposed in #13347

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[pettinarip]

Nice! thanks @TylerAPfledderer