Put the checkbox inputs inside a fieldset with <legend>

[SaptakS]

Put the checkbox inputs inside a fieldset with <legend> describing the input options in https://securedrop.org/directory/submit/

[SaptakS]

#865 (comment)

The third item on this list I think is ultimately coming from within Django. The wagtail form builder relies on Django to render checkbox list form fields and these are done without proper grouping tags.

Looks like it might be being worked on, though?

[soleilera]

@SaptakS I believe this was fixed: https://code.djangoproject.com/ticket/32338

[SaptakS]

It has been added in some capacity in Django 4.1, but we are still using Django 3.2. So till we update to the next LTS, I think maybe we should keep this issue open