Add host bekkalokk

`bekkalokk` is a new machine, meant to host web services and eventually
miscellaneous services.

hosts/bekkalokk/services/metrics/loki.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+
+}

hosts/bekkalokk/services/metrics/prometheus.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+
+}