split v1 docs into individual pages

docs/v1/examples/subcommands-categories.md

@@ -0,0 +1,50 @@
+For additional organization in apps that have many subcommands, you can
+associate a category for each command to group them together in the help
+output.
+
+E.g.
+
+```go
+package main
+
+import (
+  "log"
+  "os"
+
+  "github.com/urfave/cli"
+)
+
+func main() {
+  app := cli.NewApp()
+
+  app.Commands = []cli.Command{
+    {
+      Name: "noop",
+    },
+    {
+      Name:     "add",
+      Category: "Template actions",
+    },
+    {
+      Name:     "remove",
+      Category: "Template actions",
+    },
+  }
+
+  err := app.Run(os.Args)
+  if err != nil {
+    log.Fatal(err)
+  }
+}
+```
+
+Will include:
+
+```
+COMMANDS:
+  noop
+
+  Template actions:
+    add
+    remove
+```