Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/input.md

@@ -0,0 +1,24 @@
+---
+title: input
+layout: command
+version: 0.59.0
+---
+
+Get input from the user.
+
+## Signature
+
+```> input (prompt) --bytes-until```
+
+## Parameters
+
+ -  `prompt`: prompt to show the user
+ -  `--bytes-until {string}`: read bytes (not text) until a stop byte
+
+## Examples
+
+Get input from the user, and assign to a variable
+```shell
+> let user-input = (input)
+```
+