docs: simplify README from 1776 to 121 lines
All detailed documentation now lives at hermes-agent.nousresearch.com/docs/. README retains: banner, badges, value proposition, feature highlights, one-line install, getting started commands, docs site link table, quick contributor setup, community links, and license. Removed: 1600+ lines of inline docs covering config, messaging setup, tools, skills, MCP, terminal backends, memory, cron, hooks, security, TTS, browser, batch processing, RL training, manual installation, env vars reference, file structure, and troubleshooting.
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