[FEAT]: update contribution readme and sync with docs webpage

[XuhuiZhou]

Description

• The ## contribution section seems to be outdated
• Is there any particular reasons that we don't include the readme page in the doc? (It would be convenient if we only need to maintain one version)

Additional Information

No response

[ProKil]

I would suggest we

1. add a contribution page in the doc and leave a link to it in the readme
2. remove most of contents in readme with only the simplest examples.

We can however, add a demo, even as simple as a screen recording with a terminal view, to the readme page.

I think the readme page serves a quick intro to show what this library aims at, and the docs is the must read for anybody who wants to use our library. Just to give two examples:

1. https://github.com/pydantic/pydantic
2. https://github.com/tinygrad/tinygrad?tab=readme-ov-file

[XuhuiZhou]

Another example could be:

1. https://github.com/camel-ai/camel

They seem to facilitate an active community there

[XuhuiZhou]

The crewAI one looks pretty cool too: https://www.crewai.com/