Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/version.md

@@ -1,12 +1,19 @@
-# version
+---
+title: version
+layout: command
+version: 0.59.0
+---
 
-Outputs the nushell version.
+Display Nu version.
+
+## Signature
+
+```> version ```
 
 ## Examples
 
+Display Nu version
 ```shell
 > version
-─────────┬────────
- version │ 0.15.1
-─────────┴────────
 ```
+