fix: Update command does not work with proxy

[code2933]

Description

This PR fixed the problem that command tldr --update does not work with proxy. These unresolved issues originate from the same reason:

• tldr --update failed  #378
• Latest version not working behind proxy! #340
• proxy feature not work #326

It's a bug from axios that axios does not support HTTPS over HTTP proxy axios/axios#5037 (a dead PR).

This PR replaces axios with node-fetch with tiny changes.

Checklist

Please review this checklist before submitting a pull request.

• Code compiles correctly
• Created tests, if possible
• All tests passing (npm run test:all)
• Extended the README / documentation, if necessary

[MasterOdin]

Hi @code2933, could you please rebase your PR on the latest main?

[code2933]

Hi @code2933, could you please rebase your PR on the latest main?

Working on it. Seems I did a wrong action. I will create a new PR when it's finished.

[code2933]

Hey, I have merged previous commits and reopen this PR.

I have to note that I did not realize request timeout functionality which was introduced in PR #420 (see code here), since it's not a main feature from that PR, and I do not really know its necessity. I'm willing to add this functionality back if I'm wrong.