Remove loading.tsx for static rendering in v2

[SamyPesse]

This should fix the status code returned by Next.js for page not found.

[changeset-bot]

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Latest commit: 8f834c8

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[github-actions]

Summary of the deployments:

Version 1 (production)

Version	URL	Status
Latest commit	https://1c302240.gitbook-open.pages.dev	✅
PR	https://pr2894.gitbook-open.pages.dev	✅

Version 2 (experimental)

Version	URL	Status
Vercel	https://gitbook-v2-mfkmahhgx-gitbook.vercel.app	✅
Cloudflare		✅

Test content

Site	v1	v2
GitBook	https://1c302240.gitbook-open.pages.dev/docs.gitbook.com	https://gitbook-v2-mfkmahhgx-gitbook.vercel.app/url/docs.gitbook.com
E2E	https://1c302240.gitbook-open.pages.dev/gitbook.gitbook.io/test-gitbook-open	https://gitbook-v2-mfkmahhgx-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers (Inspect)	👍 Changes approved	188 changed	Feb 27, 2025, 4:34 PM
customers-v2 (Inspect)	👍 Changes approved	109 changed	Feb 27, 2025, 4:37 PM
default (Inspect)	👍 Changes approved	576 changed, 4 added	Feb 27, 2025, 4:39 PM