Added wiki page and cleaned up dirs and users

docs/wiki/vpn/ports/index.md

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+---
+title: Opening Ports
+---
+
+In order to open a port through a VPN you need to open a port with your VPN-provider.
+
+> **Note:** Not all VPN-providers support this feature! Notably, Mullvad does not anymore!
+
+> **Note:** The port present in the
+>   [nixarr.vpn.wgConf](https://nixarr.com/options.html#nixarr.vpn.wgconf),
+>   should not be used for any options!
+
+## AirVPN
+
+Go to the [ports page](https://airvpn.org/ports/) at AirVPN's website open
+a port. After opening it should look like this:
+
+![An open port on AirVPN, the port number that should be used in Nixarr is 12345.](./airvpn.png)
+
+Then you can set that port for a service, for example
+
+```nix {.numberLines}
+  nixarr.transmission = {
+    enable = true;
+    vpn.enable = true;
+    peerPort = 12345;
+  };
+```
+
+## Debugging Ports
+
+You can debug an open port using the
+`[vpnTestService](https://nixarr.com/options.html#nixarr.vpn.vpntestservice.enable)`.
+If the DNS and IP checks out, it will
+open a `netcat` instance on the port specified in
+`[vpnTestService.port](https://nixarr.com/options.html#nixarr.vpn.vpntestservice.port)`.
+You can then run:
+
+```sh
+  nc <public VPN ip> <specified port>
+```
+
+Where the "_public VPN ip_" is the one shown in the `vpnTestService` logs as
+your ip. Upon succesful connection type messages that _should_ show up in the
+`vpnTestService` logs.