feat: examples of agents (function calling), knowledge base

[sebastianmusial]

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[x] 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?

• missing examples for function calling

Issue Number: N/A

What is the new behavior?

Examples of agents (function calling):

• exchange rate
• weather
• pokemon

And more:

• knowledge base example
• cors configuration
• workflow improvements

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information