feat: add search box to home page

[indraneel]

Summary:

Should close what's left of #347

Expected behavior:

• makes a Search box available on home page
• navigates to /feeds?q=<search query> w/ search text contents

Testing tips:

• type in search query and press "enter" key or click "search" button

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[github-actions]

Preview Firebase Hosting URL: https://mobility-feeds-dev--pr-546-astwlv79.web.app

[Alessandro100]

[small] For the search button, can you add the style height: '55px' so the button matches the height of the input and matches the search page styling?

[Alessandro100]

left a small styling comment but otherwise works great!

[emmambd]

@indraneel Minor edit re: placeholder test (e.g. "New York" or "Carris Metropolitana")

[davidgamez]

A question for @emmambd, what is the expected behavior of a click in the search button with empty search? Currently, nothing happens. At the feeds page, a search is executed, returning the first page of all feeds results

[emmambd]

@davidgamez Good point - it should be the same behavior as the feeds page (empty = returns all feeds)

[emmambd]

Also, would be nice for the buttons not to have drop shadow (original design was flat)

[indraneel]

[indraneel]

@emmambd is this what you meant?

[davidgamez]

LGTM!