[Ext Nav] Create component: ButtonBase

[georgewrmarshall]

Description

Create a reusable UI component for ButtonBase

References

Figma component
UI component guidelines
Styling guidelines
Testing guidelines: TBC

Files needed

• index.js
• index.scss
• button-base.js
• button-base.stories.js
• button-base.test.js
• README.mdx

Technical details

TBC

Acceptance criteria

• Uses color, typography, shadows design tokens
• Uses semantic html
• PropTypes have descriptions
• Has storybook story with controls
• Has documentation in MDX
• Has unit tests and 90% coverage
• Works in Chrome and Firefox
• Performance tested: no unnecessary re-renders or other performance concerns