Update Portainer recipe to 2.0

Update Portainer recipe to 2.0

_snippets/recipe-standard-ingredients.md

@@ -0,0 +1,12 @@
+## Ingredients
+
+!!! summary "Ingredients"
+    Already deployed:
+
+    * [X] [Docker swarm cluster](/ha-docker-swarm/design/) with [persistent shared storage](/ha-docker-swarm/shared-storage-ceph.md)
+    * [X] [Traefik](/ha-docker-swarm/traefik) configured per design
+    * [X] DNS entry for the hostname you intend to use (*or a wildcard*), pointed to your [keepalived](/ha-docker-swarm/keepalived/) IP
+
+    Related:
+
+    * [X] [Traefik Forward Auth](ha-docker-swarm/traefik-forward-auth/) to secure your Traefik-exposed services with an additional layer of authentication