fix(whiteboard): self-host Excalidraw fonts instead of using the CDN

Maximilian Fußrequested to merge
m.fuss/web-app:3594-backport-missing-config-font-for-exalidraw-to-2-9-x-26-2-x into release/v2.9.x

fix(whiteboard): self-host Excalidraw fonts instead of using the CDN

Closes #3594 (closed)

(cherry picked from commit e6ab1757)

Closes #3594 (closed)

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