feat: Event Calendar

[chadbrokaw]

This pull request introduces integration with the SF Gov Open Data API to display city events on the homepage, adds a new events calendar section, and updates dependencies to support these features. The most important changes are summarized below:

Integration with SF Gov Open Data API & Event Calendar:

• Added a new useAllSFGovEvents hook in SFGovAPI.ts to fetch events from the SF Gov Open Data API, including a TypeScript interface for event data.
• Updated HomePage.tsx to use the new hook for fetching event data and to render an EventCalendar section displaying these events. The featured events section now uses the correct data source. [1] [2]

Homepage and Testing Updates:

• Updated homepage tests to mock the new SF Gov events API and reflect the addition of the events calendar section, increasing the expected number of homepage sections.

Styling Adjustments:

• Removed text-transform: capitalize from the h1 style in PageHeader.module.scss for improved heading appearance.

Dependency Upgrades:

• Added and updated several dependencies to support the new calendar and event features, including react-big-calendar, @heroicons/react, dompurify, and their type definitions, as well as upgrading moment. [1] [2]

Other Notes:

• Added commented-out code in SearchResultsPage.tsx for potential future eligibility filtering logic.