Update UseCasesTangle.tsx

[thomivy]

Summary of changes

Removed the nonfunctioning link to the parachain test explorer

Proposed area of change

Put an x in the boxes that apply.

• [ ] Overview
• [ ] Anchor System
• [ ] dApps
• [X] Tangle
• [ ] Protocols
• [ ] Relayers

Reference issue to close (if applicable)

Improves issues related to #70 and #97

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Code Checklist

• [x] I have tested that prove my changes are working as intended
• [x] I have added necessary documentation (if appropriate)

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