Upgrade to Next v14, and other updates

[adhithiravi]

• Upgrade Next.js to v14, upgrade other packages.
• Remove @next/font to use in-built next/font instead.
• Fix bug in dynamic routing to speaker slug page.

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Name	Status	Preview	Comments	Updated (UTC)
next-js-fundamentals-ajp9	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 16, 2024 2:08pm