TF-1766 Remove flight price tracker due to constant blocking by bot detection

[frankfeng98]

This PR will remove flight price tracker example as it is frequently blocked by bot detection on the website, even with stealth mode enabled. We could modify and then move the ecommerce_pricing_data example into the application example.

Here is the example link:

https://github.com/tinyfish-io/fish-tank/blob/main/examples/ecommerce_pricing_data/pricing_data.py

[rachelnabors]

It's a pity. Don't suppose there's another site we could point at that detects us less well?

[frankfeng98]

It's a pity. Don't suppose there's another site we could point at that detects us less well?

I'm planning to move the ecommerce_pricing_data example into the application example -- it's using bestbuy which does not seems to have strong bot detection.