feat: add Plausible Analytics to privacy policy

[iamacook]

What it solves

Resolves #2335

How this PR fixes it

This adds a new 5.15. section for Plausible Analytics as well as updating the last updated date.

How to test it

Open the privacy policy and observe the new section and updated date.

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://plausible_privacy_policy--walletweb.review-wallet-web.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[kirkkonen]

Checked it on the staging link, looks good! Not sure who should approve though.