Support opening web links

[ssdaniel24]

Example:

[cool guy who made kiwi.nvim](https://github.com/serenevoid)
                      ^ cursor somewhere here

hitting Enter should run $ xdg-open https://github.com/serenevoid.

[ssdaniel24]

Existing implementation from open-link.nvim.

[serenevoid]

This looks cool. But if the functionality already exists in that plugin, will it work alongside kiwi? Just wanted to check to keep kiwi leaner.

[ssdaniel24]

will it work alongside kiwi?

Don't know. Just added example of implementation.

[serenevoid]

It definitely is a good feature. I'll test it out in the future. Also, there is this default keymap gx in normal mode from Vim that opens the URL under the cursor in your default web browser. So if this feature is useful for many people, I'll consider it. Thanks for the suggestion!