Update the button component

[ayushjainrksh]

Fixes #33

Summary

• Update the title and prop description from docs.
• Remove unnecessary * from the code comments.
• Add default value to props.
  • An attempt to solve the problem of specifying the default value of a prop in a component.
  • I added the default values to the props while destructuring their actual values.
  • This would not only help the docs to get the default prop value(when automated) but also reduce hardcoded styles/values in the code.
  • Specify the default value of a prop in the code comments with @default annotation.
  • For multiple defaults (different devices) use @default {@platform android/ios}.
• Update platforms in props.
  • Use comma separated string with @platform decorator.
• Remove unused image from comments.
  • It seems outdated and no longer in use, so I removed it from the comments.
• Add Snack player example specified in the docs to the code comments with @example annotation.

[jevakallio]

@ayushjainrksh I started a review but have to jump off and continue later. Posted few comments, more to follow

[ayushjainrksh]

Okay, no problem.

[jevakallio]

Overall looking good! We need to change the multiline comment format, and get a decision from Moti regarding the default props annotations, but after those this is good to go

[jevakallio]

LGTM! One minor question in line notes