Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/error_make.md

@@ -0,0 +1,26 @@
+---
+title: error make
+layout: command
+version: 0.59.0
+---
+
+Create an error.
+
+## Signature
+
+```> error make (error-struct)```
+
+## Parameters
+
+ -  `error-struct`: the error to create
+
+## Examples
+
+Create a custom error for a custom command
+```shell
+> def foo [x] {
+      let span = (metadata $x).span;
+      error make {msg: "this is fishy", label: {text: "fish right here", start: $span.start, end: $span.end } } 
+    }
+```
+