Convert Markdown frontmatter to YAML

Some frontmatter such as the weights, menu stuff, etc is no longer used
'draft=true' becomes 'published: false'

Signed-off-by: Misty Stanley-Jones <misty@docker.com>

docs/reference/commandline/create.md

@@ -1,12 +1,8 @@
-<!--[metadata]>
-+++
-title = "create"
-description = "The create command description and usage"
-keywords = ["docker, create, container"]
-[menu.main]
-parent = "smn_cli"
-+++
-<![end-metadata]-->
+---
+title: "create"
+description: "The create command description and usage"
+keywords: ["docker, create, container"]
+---
 
 # create