fix: Add CSS styles for AsciiDoc definition lists

[raifdmueller]

Problem

Definition lists in anchor files were not visually styled, making them indistinguishable from regular text.

Solution

Add proper CSS styling for AsciiDoc definition list elements:

Definition Terms (dt):

• Bold font weight
• Proper vertical spacing
• Clear visual hierarchy

Definitions (dd):

• Indented 2rem for clear structure
• Appropriate bottom margin

Nested Definition Lists:

• Support for ::: syntax (nested definitions)
• Lighter font weight for nested terms
• Additional indentation

Visual Example

Before (no styling):

Lightweight documentation Short, focused records
Immutability ADRs are never deleted

After (with styling):

Lightweight documentation
  Short, focused records

Immutability
  ADRs are never deleted

Testing

• Tested locally with definition lists
• Nested definition lists render correctly
• Dark mode compatible

🤖 Generated with Claude Code