Added yggdrasil + connected to VPS as peer + added Zathura

modules/common/yggdrasil.nix

@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+{
+  services.yggdrasil = {
+    enable = true;
+    persistentKeys = false;
+    # The NixOS module will generate new keys and a new IPv6 address each time
+    # it is started if persistentKeys is not enabled.
+
+    settings = {
+      Peers = [
+        # Yggdrasil will automatically connect and "peer" with other nodes it
+        # discovers via link-local multicast announcements. Unless this is the
+        # case (it probably isn't) a node needs peers within the existing
+        # network that it can tunnel to.
+        #"tcp://185.165.169.234:8880"
+        #"tls://185.165.169.234:8443"
+        "tcp://10.0.0.1:4242"
+        # Public peers can be found at
+        # https://github.com/yggdrasil-network/public-peers
+      ];
+    };
+  };
+}