Create HeroSection component and update testing configs for ui lib

[tarinrickett]

Summary

Create HeroSection component and update testing configs for ui lib

Description

• New HeroSection component with optional title and subtitle and yield
• Updated ui lib testing

Developer checklist

• Used BEM naming convention
• Added new unit tests where applicable

Screenshot

Screenshot
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Testing

$ npm run test
 RUN  v1.6.0 /Users/tarin-bluedot/bluedot/libraries/ui

 ✓ src/HeroSection.test.tsx (3)
 ✓ src/Footer.test.tsx (2)

  Snapshots  5 written
 Test Files  2 passed (2)
      Tests  5 passed (5)
   Start at  15:18:39
   Duration  339ms (transform 37ms, setup 0ms, collect 238ms, tests 15ms, environment 176ms, prepare 81ms)