Configure an ansible playbook (#5)

* Configure an ansible playbook
to copy all required configurations to a Poseidon host.

* Copy also all TLS certificates if configured

* Exclude playbook in its own repository

* Adjust security.md to our current recommendations

* Add certificate generation and deployment

* Move access policy example file to the resources folder

docs/resources/client.example.hcl

@@ -0,0 +1,15 @@
+client {
+    enabled = true
+    servers = [
+        "server domain 1",
+        "server domain 2"
+    ]
+}
+
+# plugin "docker" {
+#   config {
+#     auth {
+#       config = "/root/.docker/config.json"
+#     }
+#   }
+# }