Move docker artefacts into /docker directory

docker/.env.example

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+# Bitcoin Core data directory
+# This should point to your Bitcoin Core data directory
+BITCOIN_DATA_DIR=/path/to/bitcoin
+
+# Bitcoin Core RPC configuration
+# If running Bitcoin Core on the same host (not in Docker), use host.docker.internal on macOS/Windows
+# or the host's IP address on Linux
+BTC_RPC_HOST=localhost
+BTC_RPC_PORT=8332
+
+# Use either cookie file authentication (recommended) or username/password
+# Cookie file is automatically created by Bitcoin Core
+# If using username/password, comment out RPCCOOKIEFILE in docker-compose.yml
+# BTC_RPC_USER=your_rpc_username
+# BTC_RPC_PASSWORD=your_rpc_password
+
+# BRK configuration
+# Services to run: all, processor, or server
+BRK_SERVICES=all
+
+# Computation mode: lazy (compute on demand) or eager (precompute and save)
+BRK_COMPUTATION=lazy
+
+# Data format: raw (faster) or compressed (saves disk space)
+BRK_FORMAT=raw
+
+# Enable price fetching from exchanges
+BRK_FETCH=true
+
+# Enable Model Context Protocol (MCP) for AI/LLM integration
+BRK_MCP=true
+
+# BRK data storage options
+# Option 1: Use a Docker named volume (default, recommended)
+# This is the default configuration - no changes needed.
+# Leave this commented to use the default named volume
+# BRK_DATA_VOLUME=brk-data
+
+# Option 2: Use a bind mount to a local directory
+# Uncomment and set this to use a specific directory on your host
+# Also uncomment the corresponding line in docker-compose.yml
+# BRK_DATA_DIR=/path/to/brk/data