Update docs Accessing entire domains within networks

[damasosanoja]

This is an updated version of the current guide.

Please notice I didn't add the footer, please let me know if this is done automatically or if I need to add it manually:

## Get started
<p float="center" >
    <Button name="button" className="button-5" onClick={() => window.open("https://netbird.io/pricing")}>Use NetBird</Button>
</p>

- Make sure to [star us on GitHub](https://github.com/netbirdio/netbird)
- Follow us [on Twitter](https://twitter.com/netbird)
- Join our [Slack Channel](https://join.slack.com/t/netbirdio/shared_invite/zt-2utg2ncdz-W7LEB6toRBLE1Jca37dYpg)
- NetBird [latest release](https://github.com/netbirdio/netbird/releases) on GitHub