docs: add driver description and demo

[gracetxgao]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/graycoreio/daffodil/blob/develop/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

What is the new behavior?

Documentation added for Stackblitz demo built for #1876

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[damienwebdev]

The only further change I see is that this should probably be in docs/guides/

changes applied.