Standardize installation directory paths

Maintain consistent and separate installation paths for different build types to prevent conflicts and improve system organization. Use /hab directory for Habitat builds and /opt/chef for Omnibus installations.

Key guidelines:

• Place Habitat-built components under /hab/ directory
• Keep Omnibus installations under /opt/chef/
• Use distinct directories for migration tools (e.g., /hab/migration/)
• Avoid mixing paths between build types

Example directory structure:

# Habitat builds
/hab/
  ├── chef/
  │   └── bin/
  └── migration/
      ├── bin/
      └── bundle/

# Omnibus installations
/opt/chef/
  ├── bin/
  └── bundle/

This separation enables:

• Clear distinction between installation types
• Easier cookbook checks and compatibility verification
• Simplified upgrade paths
• Prevention of file conflicts between different versions