[DOC] Wiki has broken link

[chowkapow]

In the wiki homepage, the npm help install link is broken.

The correct link should be https://docs.npmjs.com/cli/install

[Blaussh]

✅ Enjoy! https://github.com/Blaussh/cli/wiki @chowkapow ^^

[chowkapow]

@Blaussh Thanks! How did you fork the wiki to your repo? Mine doesn't show it.
Do you know how to make a PR against the wiki?

[Blaussh]

@chowkapow I used this approach to fork the wiki to my repo.
Sorry, I don't know how to make a PR against the wiki...

[darcyclarke]

Fixed, thanks!