[Documentation] Syntax guide

[chriseppstein]

Incomplete outline of this portion of the documentation:

• Block Styles
  • Scopes
  • Classes
  • Attributes
    • Boolean attributes
    • Attributes with values
  • Legal Selectors
• Referencing a block or block style.
  • @block - Referencing a block
  • Styling an element based on another block's attribute.
  • block paths
• Exporting Blocks
• Debugging a block's interface
• Block Interfaces and Inheritance
• Style Compositions
• Resolving Block Conflicts
  • Override Resolution
  • Yield Resolution