Examples 'nice to haves'

[cholmes]

With the examples refresh there are a ton more of little improvements that we could do. Indeed I could probably spend several days making the most awesome 'fake' catalog. But that's not the best use of time at the moment. So I'm moving all the 'extras' ideas here. I think we can ship 1.0.0-RC1 without any (though others feel free to push back), but keeping for posterity.

• Add more items in the 'extensions collection' that show off more of the core extensions functionality, but based on the core examples. Would be good to also have one or two that link to some of the more mature extensions that didn't make the core cut, like sar and file.
• Update 'roles' to show off more of the latest roles best practice stuff in Roles best practice #989
• Have all items use totally different data (right now the main examples are basically three copies of the same data) - create assets, get the right bounds and other data, generate extents to be right, etc.
• demonstrate use of a remote schema (using one of the extensions not in the core repo - likely easier after we move extensions out of the core repo)
• Add another catalog example that just shows how it can be used to organize items? We just have one pure catalog example now, which is 'above' collections, could make sense to have one 'below', but I'm not sure what items to put in it. Perhaps if we have an extension with two examples we can put it in its own catalog.
• Update any eo:bands to follow recommendations in Eo clarifications #974 - ideally one that just uses assets, and one that is a nice summary of assets in properties.
• Better summaries, and have a range of items that it actually fully summarizes. Add one to the extensions collection
• Bug reports for STAC Browser to display everything right - start_datetime & end_datetime (in the catalog link of the item), proj shape/transform, update to use 'visual' role (things work fine now, but should try to use it if it's there).
• Get a stable location for a browser (could be stacindex), update rel=alternate / type=html to that location and advertise that as well.
• Register remotedata.io (the sample provider) and make it so all the links work
• Figure out an automated way to keep self links up to date through releases