added external directives to Notifications, change case of keys in host, and update docs

docs/content/cli/list.md

@@ -0,0 +1,29 @@
+---
+title: List
+---
+
+
+List commands, lists, or hosts defined in config file
+
+Usage:
+```
+  backy list [command]
+```
+
+Available Commands:
+  cmds        List commands defined in config file.
+  lists       List lists defined in config file.
+
+Flags:
+```
+  -h, --help   help for list
+```
+
+Global Flags:
+```
+      --cmdStdOut            Pass to print command output to stdout
+  -f, --config string        config file to read from
+      --log-file string      log file to write to
+      --s3-endpoint string   Sets the S3 endpoint used for config file fetching. Overrides S3_ENDPOINT env variable.
+  -v, --verbose              Sets verbose level
+```