[a11y] Issue 11: Missing heading hierarchy (Participation Page)

[NewJerseyStyle]

Description:

The participation page lacks a clear hierarchy of headings, making it difficult for users of assistive technologies to navigate and understand the page structure.

Steps to Reproduce:

1. Navigate to the participation page (e.g. https://pol.is/4cvkai2ctw)
2. Review the heading structure using a screen reader or browser's developer tools.

Expected Behavior:

A logical and consistent hierarchy of headings (<h1>, <h2>, <h3>, etc.) should be present.

Actual Behavior:

The heading hierarchy is inconsistent and lacks proper structure.

Component/Area: Participation page

Source: Other

Affected Elements: headings

[thomassth]

Should be fixed with #32 ?