[Docs] - Excel examples from openapi.json

[montezdesousa]

Draft: this can only be merged when openbb v.4.1.6 is deployed to prod and Excel in sync

1. Why?

   • Examples were generated from generate_excel_markdown.py code
   • They were not tested
   • Few examples

2. What?

   • Refactor code to create examples from openapi.json
   • Move website related paths to website/.gitignore

3. Impact (1-2 sentences or a bullet point list):

   • Examples generated from openapi.json => multiple tested examples
   • Any updates on the platform will be reflected here without any change

4. Testing Done:

   • python generate_excel_markdown.py and npm run dev, check examples and new endpoints are there