fix: fix datatype docs

[elsapet]

Description

Update datatypes.js to handle updated structure of category grouping JSON
Note: categories can now be in more than one group, so there will be some duplicate displays (e.g. "Medical and Health" appears in PHI, Sensitive, and Personal Data groups)

Checklist

• I've added test coverage that shows my fix or feature works as expected.
• I've updated or added documentation if required.
• I've included usage information in the description if CLI behavior was updated or added.
• PR title follows Conventional Commits format

[markmichon]

LGTM. I'll handle the ID clashes for table of contents links in the theme PR since it already changes those lines.