Create faqs.mdx

[thomivy]

Summary of changes

Added FAQ page

Proposed area of change

Put an x in the boxes that apply.

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

Reference issue to close (if applicable)

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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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[dutterbutter]

Reminder to address requested changes @thomivy