Post collections

Some posts benefit from being read in sequence. For example, our ARIA roles, states, and properties posts.

I'm thinking a collection is a lot like a learning track, where it can tie together content from different categories, so long as it all builds towards teaching an overall concept.

We'll need to:

• Identify some initial collection bundles
• Set a reading order for each bundle's collection of posts
• Create and add the metadata to our posts
• Design a visual treatment to indicate a post is part of a collection

We may also need to create landing pages for collections, to show each post and its reading order.