Added units, foods, tags and step images

Features

• Added units and food types to recipe ingredients
  • #20 PR by @alexdetsch
• Added tags to recipes (only adds kptncook at the moment
  • #20 PR by @alexdetsch
• Added step images to recipe instructions
  • #20 PR by @alexdetsch

Refactoring

• Review and refactoring
  • #20 PR by @ephes
• Updated pre-commit hooks
  • by @ephes

Fixes

• Documented python / mealie version requirements
  • #20 PR by @alexdetsch