docs: generate markdown

Keep frontmatter for docker, dockerd and index markdown files.
Also needs to move cli.md > docker.md before generation and
then move it back because cli.md is needed for yaml generation on docs
website: https://github.com/docker/cli/pull/3924#discussion_r1059986605

Signed-off-by: Kevin Alvarez <crazy-max@users.noreply.github.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/commandline/plugin_push.md

@@ -1,18 +1,16 @@
----
-title: "plugin push"
-description: "the plugin push command description and usage"
-keywords: "plugin, push"
----
-
-```markdown
-Usage:  docker plugin push [OPTIONS] PLUGIN[:TAG]
+# plugin push
 
+<!---MARKER_GEN_START-->
 Push a plugin to a registry
 
-Options:
-      --disable-content-trust   Skip image signing (default true)
-      --help                    Print usage
-```
+### Options
+
+| Name                      | Type | Default | Description        |
+|:--------------------------|:-----|:--------|:-------------------|
+| `--disable-content-trust` |      |         | Skip image signing |
+
+
+<!---MARKER_GEN_END-->
 
 ## Description