chore: add hotjar

[chambaz]

Adds HotJar tracking script to landing page, mfi, arena

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
marginfi-landing-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 21, 2024 2:46pm
marginfi-v2-trading	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 21, 2024 2:46pm
marginfi-v2-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 21, 2024 2:46pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
marginfi-v2-docs	⬜️ Skipped (Inspect)			Oct 21, 2024 2:46pm

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_{Last updated for commit 3be46bd. This comment will update as new commits are pushed.}