docs(usb-creator): update boot media guidance

[Eli Bosley (elibosley)]

Summary

This follow-up to #524 updates the screenshot-led guide for creating a new Unraid USB boot device with the USB Creator.

Why This Exists

The page previously provided only a high-level six-step outline and included stale USB-only guidance. Users needed current boot-device choices, a clear warning about erasing the selected drive, and guidance for first boot and older BIOS-only systems.

Resolution

Expand the existing Create an Unraid USB drive page with the five merged USB Creator screenshots, step-by-step UI actions, optional server/network customization notes, current flash-versus-internal-boot guidance for Unraid 7.3+, UEFI/legacy BIOS instructions, and troubleshooting.

Reviewer Considerations

• Confirm the stable-release guidance and the optional development-image warning match the intended USB Creator experience.
• Check the platform-specific legacy BIOS script names and first-boot guidance.
• Confirm that internal boot is described as an onboarding choice after the initial USB boot.
• Confirm that the USB Creator guidance does not impose a drive-capacity range; the remaining 32 GB reference applies only to Windows FAT32 formatting for manual installs.
• The manual installation section remains in place; this change improves the recommended automated path rather than replacing it.
• Screenshot references target the assets merged in origin/main by docs: refresh USB Creator setup screenshots #523.

Behavior Changes

Documentation-only. Users now see a complete path from USB Creator download through first boot, with flash boot or internal boot choices, troubleshooting for missing drives and boot failures, and GUID licensing guidance.

Implementation Summary

• Renamed the page label/title to Create an Unraid USB drive.
• Expanded the automated install section with five screenshot-linked workflow steps.
• Documented optional Server name, Wi-Fi, and Network customization.
• Removed the outdated 4–32 GB recommendation and separated the Windows FAT32 formatting limit from USB Creator capacity guidance.
• Added the Unraid 7.3+ internal boot path and removed unrelated virtualization/IOMMU setup from the USB creation procedure.
• Added UEFI versus BIOS-only boot guidance and troubleshooting.

Verification

• ./node_modules/.bin/remark docs/unraid-os/getting-started/set-up-unraid/create-your-bootable-media.mdx --quiet --frail
• ./node_modules/.bin/prettier --check docs/unraid-os/getting-started/set-up-unraid/create-your-bootable-media.mdx
• git diff --check
• Verified all five screenshot paths resolve against origin/main.
• Full Docusaurus build not run because repository guidance discourages it for routine docs edits.

Risk

Low. Documentation-only change; the page links to existing screenshot assets and leaves the manual install instructions intact.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0914240 and 2ebee1a.

📒 Files selected for processing (1)

• docs/unraid-os/getting-started/set-up-unraid/create-your-bootable-media.mdx

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