[Component README]: Update documentation to include component markup examples

[jeffchew]

The problem

The current READMEs for each of the components do no include markup examples on how to utilize the components. In addition, the canvas component does not seem to provide any value since the storybook canvas itself can be the preview of it:
https://web-components.carbondesignsystem.com/?path=/docs/components-accordion--default

In comparison, the Carbon for IBM.com READMEs include details on how to implement, including how to use CDN vs ES approach:

https://www.ibm.com/standards/carbon/web-components/?path=/docs/components-card-group--default

The solution

Update the component READMEs to include implementation guidelines, sample code, and remove the canvas component.

Application/website

Carbon Web Components

Business priority

Medium Priority = upcoming release but is not pressing

What time frame would this ideally be needed by (if applicable)

No response

Examples

Carbon for IBM.com Web components storybook:

https://www.ibm.com/standards/carbon/web-components

Code of Conduct

• I agree to follow this project's Code of Conduct
• I checked the current issues for duplicate issues