chore(website): improve cypress performance

[saeta-eth]

This PR aims to improve the performance of the Cypress test suite. The goal is to replace the Next.js development server with the output of the build process and run a static file server instead. This approach makes testing faster and more reliable than before. I've included some screenshots showing the improvements:

Before

After:

Overall, the Cypress tests finish in approximately ~8 minutes, compared to the previous ~20 minutes:

Before:

After:

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Latest commit: bfe6166ccbc436694babd8608de8550716b7304f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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