docs: zero-to-hero README and docs/

[JarbasAl]

Brings the README and docs/ to zero-to-hero quality for hivemind-docker.

• Rewrites the README to remove meta-commentary/jokes/emojis and describe the current state accurately: tagline, where it sits in a HiveMind mesh, the image table, prereqs, quickstart (compose up a hub), other roles, Buildx Bake build commands, configuration + docs pointers.
• Adds docs/: deploy (roles, ports, volumes, management, SSL), compose-reference (every compose file + service + named volume), configuration (env vars), building (Bake targets/flags/variables).

Base branch is feat/initial — confirmed as the repo's GitHub default branch (no master; a stale dev exists but is not the default and is behind). No CI/release workflows present on this branch.

Docs only — no code, version, or workflow changes.

🤖 Generated with Claude Code

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