chore: correct and clear up readme

[shentongmartin]

What type of PR is this?

update the readme file:

1. remove workflow section because it's not yet in main branch.
2. replace react agent code with a link.
3. modify stream processing section to be more correct and clear.

[github-actions]

📊 Coverage Report:

File coverage threshold (20%) satisfied:	PASS
Package coverage threshold (30%) satisfied:	PASS
Total coverage threshold (75%) satisfied:	PASS
Total test coverage: 83.1% (2961/3565)

[hi-pender]

LGTM