Add dashboard template/pages for test mechanisms

[lukefretwell]

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Would be great to add a dashboard page for each of the testing mechanisms.

Describe the solution you'd like A clear and concise description of what you want to happen.

• Add pages for each testing mechanism (/metadata /url)
• For these pages, h1 ('Metadata', 'URL'), short description
• grade/score cards for all, federal, state, local
• h2 status table?
• h2 changelog
• h2 documentation with links to doc pages

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

N/A

Additional context Add any other context or screenshots about the feature request here.

[lukefretwell]

Something to consider is subnavs for these pages that can paginate (changelog/status) or filter federal/state/local (status).