[kjlippold]

Updated the documentation to fix stale references to v1 features, cover new v2 features, fix broken example URLs, and other minor readability enhancements.

[kjlippold]

@horsburgh I updated the data dictionary to use camelCase field names instead of snake_case to match the diagrams and API. I can also easily switch both back to snake_case if you'd prefer (which technically matches the internal DB), but I think the dictionary and diagrams should be consistent with each other either way. Also let me know if you want to make any other changes to either the dictionary or diagrams.

I also greyed out and added a strikethrough the HistoricalLocation and FeatureOfInterest tables in the DB model to make it more clear that those aren't actually tables we've implemented, but I can also either remove them or revert the styling to how it was before too.