Removing deprecated semantic-ui package and example

[mgcm]

Semantic UI package and examples are no longer maintained, only MUI. This PR removes the assets from the repo.

✔️ Checklist

• [] A changeset describing the change and affected packages (more info).
• Added or updated documentation.
• Tests for new functionality and regression tests for bug fixes.
• Screenshots or videos attached (for UI changes).
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[changeset-bot]

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Latest commit: cbb1813

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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[maheichyk]

@mgcm could you please merge with main?

[mgcm]

@maheichyk updated to latest main and resolved conflicts! 🚀

[maheichyk]

lgtm!