Add Guidelines for new component variants / layouts

[andrew-ronaldson]

Develop usage guidelines and documentation for PatternFly components updated or introduced with new variants in the unified theme. Cover best practices, visual examples, and migration tips.

This list is subject to change. This could be better suited as an its own Epic with sub-issues.

• Hero Card

• Featured card

• Docked nav

• Inline pilled drawers

• Drawer handle

• Form control elements (squared vs. pilled)

• Compass

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Jira Issue: PF-3681