Replaced with Docusaurus platform and restructured content

[scott-klaytn]

Proposed changes

• Describe your changes to communicate to the maintainers why we should accept this pull request.
• If it fixes a bug or resolves a feature request, be sure to link to that issue.

Types of changes

Please put an x in the boxes related to your change.

• Minor Issues and Typos
• [ x ] Major Content Contribution
• Others

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to reach out. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [ x ] I have read the CONTRIBUTING GUIDELINES
• [ x ] I have signed the CLA
• [ x ] I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

Related issues

• Please leave the issue numbers or links related to this PR here.

Further comments

If this is a relatively large content contribution, kick off the discussion by explaining why you would suggest the content contribution, etc...