feat: Introduce the USWDS Site Alert as info banner, use the USWDS Banner as intended

[dzole0311]

Closes: #1235

Demo: https://www.loom.com/share/f7c5868033054d859a0a4177722951a6?sid=42347137-07f4-46de-8f1d-25021ccf3204

Description of Changes

1. Replaced the Banner component with SiteAlert but kept some of the core functionalities such as the expiration date feature and close button
2. Re-factored the Banner to align with its intended USWDS role i.e. showing government information at the top of every page

Notes & Questions About Changes

I'm still a little unsure whether the Banner and SiteAlert components should live within the veda-ui library or be implemented specifically within the instances. Since Banner was already part of the veda-ui, I followed the same approach for the SiteAlert.

Validation / Testing

See the configuration for the SiteAlert and the Banner here. Note: Run yarn clean to clear the Parcel cache if the changes you make in the config are not reflected in the UI

Banner testing:

1. Check that the banner appears consistently across all pages when navigating routes
2. Check that the expand/collapse button ("Here's how you know") works
3. Check that the banner looks good on smaller screens as well

SiteAlert testing:

1. Check that the SiteAlert is shown when:

• Content exists for the alert
• The expiration date is not reached
• The alert has not been dismissed by the user

2. Check these refresh scenarios:

• Without closing the alert, refresh the page to verify that it reappears
• After closing the alert, refresh the page to verify that it remains hidden

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[AliceR]

What is he doing? 😄

[dzole0311]

I needed a way to properly decode the html string passed in the configuration for the banner, so it would be rendered as a valid html, but I'm open to other approaches or suggestions.