About Security Content

[heyitsmebev]

As part of the new About Notify content section, this PR is the implementation for "Security"

Definition of Done

• Should include a side navigation
• Should be able to easily navigate to About Notify content
• Should meet a11y standards

Figma:
https://www.figma.com/proto/aAWhlPzOP6kfVFnCCAfSZZ/notify.gov?page-id=2339%3A3817&node-id=5392-875&node-type=frame&viewport=2870%2C-701%2C0.48&t=nfkxOXnOCIFQB1yK-1&scaling=min-zoom&content-scaling=fixed&starting-point-node-id=5392%3A875

Content:
https://docs.google.com/document/d/1lP8I0Jxu0B26cmTGBQcoHCbfSvKKHQBE6gzTL9HUheE/edit?tab=t.0#heading=h.icyigvoln8tg

[jonathanbobel]

@heyitsmebev all links that leave the Notify.gov site need an external link icon added
https://designsystem.digital.gov/components/link/

Example:

 <a
    class="usa-link usa-link--external"
    rel="noreferrer"
    target="_blank"
    href="https://i.giphy.com/media/WPzQF6ruiIIVzHNlwX/source.gif"
    >external website</a
  >.

[dmvancura]

Security is a subpage to the About Notify section. It is navigated to after a user selects to view the About Notify section. @CathyBeil and @jonathanbobel, correct, yes? Note: It is in front of the login, but i understand that's a different PR.

[heyitsmebev]

@dmvancura i revised the menu hierarchy in this PR. Security is indeed a subnav

[jonathanbobel]

LGTM

[dmvancura]

anything else needed on 2127? github is a bit confusing and i can't tell by looking through this, so let me know if i need to help with anything else @jonathanbobel