[Feature Request] Add verbose/debug flag for better troubleshooting

[zaremb]

I am experiencing issues with tldr when trying to fetch the page for tar. There is no error message other than "Page not found.":

❯ tldr tar
✔ Page not found. Updating cache...
✔ Creating index...
Page not found.

This issue seems to be related to my complex network setup (company laptop with custom certificates, running on WSL). I suspect there might be a networking issue blocking the request, but I have no way of investigating further due to the lack of detailed output or logs. I tried TLDR_ALLOW_INSECURE=1

Suggestion:
Add a --verbose flag to show detailed output of what tldr is doing.
Alternatively, add debug flags to provide more granular logging.
If there is already a debug flag, it would be helpful to mention in in README.

The issue is likely on my side, but without detailed logs, I cannot progress.
Thank you for your assistance!