Add projects to explore page

[neelasha23]

We need to add these recently added examples to the explore page.

1. FastAPI: Chat with Github
2. Shiny R: graph
3. Streamlit: Mirascope URL Extractor

[neelasha23]

Added Igraph and Mirascope:

[edublancas]

are you planning to add the fastapi one?

[neelasha23]

yes I'll add