Update docker launch command

[cliffhall]

Summary

Update the docker launch command in the README.md to

docker run --rm \
  -p 127.0.0.1:6274:6274 \
  -p 127.0.0.1:6277:6277 \
  -e HOST=0.0.0.0 \
  -e MCP_AUTO_OPEN_ENABLED=false \
  ghcr.io/modelcontextprotocol/inspector:latest

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation update
• Refactoring (no functional changes)
• Test updates
• Build/CI improvements

Related Issues

Although the existing command did work at one time, people have been getting "Docker Connection Refused" issues. I researched it and found the appropriate command to use. #828 (comment)

Additional Context

This fixes #828