Fix heading weights in directory pages

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**A clear and concise description of what the problem is. Please include the content type/s if applicable.**
We have made a couple directory (curated list) pages thus far. However, the automatic heading weights that the template creates for a person's title are not formatted correctly. They jump to heading 6, which is inaccessible.

**What would you like to see added or changed? Why? Include any benefits, challenges, or considerations. This can be short and sweet.**
Revisit the directory template and adjust heading weights to be accessible.

**Add any other context, use cases, or screenshots about the feature request here.**
Example: [Purchase of Service Office staff directory](https://edit.mass.gov/lists/purchase-of-service-office-staff-directory)


Start by locating the directory template responsible for the heading structure and compare it with the Purchase of Service Office staff directory example. Confirm the current heading sequence and adjust the template so directory pages use accessible heading levels rather than jumping to heading 6.

Written by the indexing model from the issue text.