Updated the Cloudflare R2 setup instructions in `content/upload-content.md` to include `POST` and `HEAD` in the `AllowedMethods` CORS configuration. This is necessary for multipart uploads (which use POST) and verification checks (which use HEAD) to function correctly.
Updates `content/upload-content.md` and `docs/storage-r2.md` to reflect the current manual configuration workflow for Cloudflare R2 storage.
Key changes:
- Removes deprecated instructions for generating "Admin Read & Write" or "Workers R2 Storage" automation tokens.
- Documents the new requirement to manually create a bucket and enable "Public Access" (r2.dev subdomain) in the Cloudflare Dashboard.
- Adds explicit instructions for manually configuring CORS policy via the Cloudflare Dashboard, providing the required JSON configuration.
- Aligns the "Configure bitvid" steps with the application's current UI, which requires the "Public Bucket URL" as an explicit input.
- Clarifies that "Object Read & Write" permissions are sufficient and recommended for security.
- Create `assets/svg/upload-content-icon.svg`
- Create `content/upload-content.md` with Cloudflare R2 setup instructions
- Create `views/upload-content.html` to render the guide
- Add "Learn How" link to `components/upload-modal.html` in the R2 credentials section
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