Implementation of storybook

[muratcorlu]

• Component story format converted to mdx. This way component stories are much simpler and clearer.
• Some example documents added for the design system. I used built-in components that Stroybook provides for Color Palette, Typography and Iconography.
• Simplified Storybook configuration and dependencies.
• Some example stories added for gr-button component.

I'm working on fixing those:

• Boolean attributes are having empty string values in code examples. Like <gr-button block="">Save</gr-button> It should be same as we write in story file (<gr-button block>Save</gr-button>)
• styles property of components are visible in auto-generated reference list. It should not mentioned in that list.
• Editable property list should be visible in Canvas tab to play with properties.
• Accessibility plugin is not visible.

Closes #78

[muratcorlu]

• Boolean attributes are having empty string values in code examples. Like <gr-button block="">Save</gr-button> It should be same as we write in story file (<gr-button block>Save</gr-button>)

I couldn't find a solution for this item. I mentioned this issue in multiple slack workspaces that I'm involved but couldn't reveice any suggestion. Also asked on StackOverflow. No answer yet.

[muratcorlu]

I'm merging this without a solution for code example issues. We'll check that topic again soon.

[github-actions]

🎉 This PR is included in version 2.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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