nanopos: add netns

- Adds nanopos to netns-isolation.services
- Adds cfg.enforceTor and extraArgs to bring nanopos in line with other
  services
- Adds charged-url option to allow using nanopos with network
  namespaces.
- Modularizes nginx so webindex can be used without nanopos.
- Adds host option (defaults to localhost) as target of hidden service
- Removes unnecessary after

modules/netns-isolation.nix

@@ -115,6 +115,10 @@ in {
           # communicates with clightning over lightning-rpc socket
           connections = [];
         };
+        nanopos = {
+          id = 19;
+          connections = [ "nginx" "lightning-charge" ];
+        };
       };
 
       systemd.services = {
@@ -271,6 +275,12 @@ in {
       # lightning-charge: Custom netns configs
       services.lightning-charge.host = mkIf config.services.lightning-charge.enable netns.lightning-charge.address;
 
+      # nanopos: Custom netns configs
+      services.nanopos = mkIf config.services.nanopos.enable {
+        charged-url = "http://${netns.lightning-charge.address}:9112";
+        host = netns.nanopos.address;
+      };
+
     })
     # Custom netns config option values if netns-isolation not enabled
     (mkIf (!cfg.enable) {