Sync the extracted website README with the current repo README after the
org rename + BRAND_* branding work: UOMysticmoon → Runic Gateway as the
default identity (UOMysticmoon retained only as the example first instance),
UOM/link → RunicGateway/link, DB/cookie/TOTP defaults updated, and the new
Branding section added. Doc-local BACKEND_DESIGN.md links kept relative;
the .env.uomysticmoon.example link points at the website repo where it lives.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XmHdsbnLzDMAVQkAoTQSBe
