Add support for getting resources by name

- add singular alias to get commands
- allow filtering the get commands result by resource name
- add the image commands to mkdocs index

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

cmd/flux/get_receiver.go

@@ -33,9 +33,10 @@ import (
 )
 
 var getReceiverCmd = &cobra.Command{
-	Use:   "receivers",
-	Short: "Get Receiver statuses",
-	Long:  "The get receiver command prints the statuses of the resources.",
+	Use:     "receivers",
+	Aliases: []string{"receiver"},
+	Short:   "Get Receiver statuses",
+	Long:    "The get receiver command prints the statuses of the resources.",
 	Example: `  # List all Receiver and their status
   flux get receivers
 `,