[Publisher] Update Help Center Guide for New Settings Page

[mxosman]

Description of the change

Update copy, links and screenshots within the Help Center Guide for new Settings page.

Related issues

Closes #1337

Checklists

Development

This box MUST be checked by the submitter prior to merging:

• Double- and triple-checked that there is no Personally Identifiable Information (PII) being mistakenly added in this pull request

These boxes should be checked by the submitter prior to merging:

• Tests have been written to cover the code changed/added as part of this pull request

Code review

These boxes should be checked by reviewers prior to merging:

• This pull request has a descriptive title and information useful to a reviewer
• This pull request has been moved out of a Draft state, has no "Work In Progress" label, and has assigned reviewers
• Potential security implications or infrastructural changes have been considered, if relevant

[helperbot-recidiviz]

@mxosman successfully triggered a playtest deployment. Full deployment usually takes 5 minutes. Your playtest link is https://mahmoudtest---publisher-web-b47yvyxs3q-uc.a.run.app/

[morden35]

thank you Mahmoud! looks fantastic!

[mxosman]

Thank you for the lightning fast reviews, Michelle!!