fix(deertopia): Persist SSL certs

modules/nixos/deertopia/nginx.nix

@@ -71,7 +71,7 @@ in
     services.nginx.enable = true;
 
     networking.firewall.allowedTCPPorts = [
-      80  # HTTP
+      80 # HTTP
       443 # HTTPS
     ];
 
@@ -85,6 +85,11 @@ in
       defaults.email = "lomiskiam@gmail.com";
     };
 
+    sydnix.impermanence.directories = [
+      # Don't regenerate certs on reboot.
+      "/var/lib/acme"
+    ];
+
     services.nginx.virtualHosts =
       builtins.listToAttrs
         (builtins.map