Create tutorials and documentation for the codebase

[husseinmozannar]

create tutorials and documentation for different parts of the codebase:

1. tutorial on building your web agent:

• launch browser
• control it with playwright controller
• som prompting
• tool calling with model to tie it all together

2. tutorial on web agent evaluation with /eval

[mmurad2]

1 is addressed with https://husseinmozannar.github.io/#/blog/web_agent_tutorial