Update Patterns to Demo Block Helper

[jryanconklin]

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Issue

Default patterns are currently setting their pattern demo information as manual html. This causes an issue when viewing pattern usage. To simplify this, we've included a demo-block proton pattern. Legacy patterns should be updated to use this.

Confirmation

All default patterns will implement demo-block and include data to demonstrate usage. Update docs to include clarification on approach for protons here: demo-block is an exception to the rule of including protons in other patterns.