Refresh UltraEdge README with Field Guide branding and current features

[heybeaux]

Refresh the README with the current alpine trail icon and Field Guide identity. Describe build 8 planning, mandatory gear, photos, guide attachments, brand selection, crew logistics and optional live sharing, including their actual offline and data boundaries.

Correct the obsolete local-only feature description and remove the MIT claim/broken LICENSE link because the repository contains no license file. Preserve development and release guidance, and distinguish TestFlight/simulator evidence from public-release acceptance.

Validation: all 10 local document/image links resolve; git diff --check passes. README-only change; no runtime code changed.

[coderabbitai]

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Run ID: cd7a79f4-4dab-4872-b514-531c0699b5b4

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