Uninstall unused @mui/material package

[jessepinho]

This is one of a number of PRs I'm splitting off from https://github.com/penumbra-zone/web/pull/1464/files

[changeset-bot]

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Latest commit: 3e6a363

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Visit the preview URL for this PR (updated for commit 3e6a363):

https://penumbra-ui-preview--pr1487-jessepinho-uninstall-kefh78cp.web.app

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