Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/date_format.md

@@ -0,0 +1,33 @@
+---
+title: date format
+layout: command
+version: 0.59.0
+---
+
+Format a given date using the given format string.
+
+## Signature
+
+```> date format (format string)```
+
+## Parameters
+
+ -  `format string`: the desired date format
+
+## Examples
+
+Format a given date using the given format string.
+```shell
+> date format '%Y-%m-%d'
+```
+
+Format a given date using the given format string.
+```shell
+> date format "%Y-%m-%d %H:%M:%S"
+```
+
+Format a given date using the given format string.
+```shell
+> "2021-10-22 20:00:12 +01:00" | date format "%Y-%m-%d"
+```
+