Update API endpoint for fetching chains

[kumaryash90]

PR-Codex overview

This PR updates API fetch calls to use a dynamic API host constant instead of hardcoded URLs.

Detailed summary

• Updated API fetch calls in fetchChainsFromApi, [chainSlug]/index.tsx, and fetchChain.ts to use ${THIRDWEB_API_HOST} constant.
• Imported THIRDWEB_API_HOST constant from constants/urls.
• Removed hardcoded API URLs and replaced with ${THIRDWEB_API_HOST} constant for flexibility.

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Name	Status	Preview	Comments	Updated (UTC)
thirdweb-www	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 29, 2024 2:38pm

[jnsdls]

📝 Changed routes:

/[chainSlug]
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Commit 75af1a3b624057d46eb9234c3987aab529be9459 (https://thirdweb-g8fxtiu6j.thirdweb-preview.com).