[DOCS] Trovares demo

[lmeyerov]

As discussed, we should get a Trovares sample notebook in, even if not yet a formal connector:

• [ ] Upload nodes/edges df
• [ ] Query for property graph
• [ ] Inspect returned nodes/edges df
• [ ] Visualization
• [ ] Link on homepage

Separately tracking getting this linked into our dashboard

Reference: https://github.com/trovares/pyxgt/tree/main/demos

( + @dhaglin )

[lmeyerov]

Defer to 2.41 due to pyarrow deps