[FEATURE]Proxy Support

[topshihun]

Is your feature request related to a problem? Please describe.
I can't directly access Wiki without proxy.

Describe the solution you'd like
The command-line or configuration options of the program should include a proxy option.
Just like this wiki-tui --proxy=socks5h://localhost:8080

Describe alternatives you've considered
I noticed the previous issue mentioned terminal global proxy, but it's in convenient.

Additional context

Checklist

• checked that this feature wasn't requested before in an issue
• read CONTRIBUTING.md