Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/ignore.md

@@ -0,0 +1,19 @@
+---
+title: ignore
+layout: command
+version: 0.59.0
+---
+
+Ignore the output of the previous command in the pipeline
+
+## Signature
+
+```> ignore ```
+
+## Examples
+
+Ignore the output of an echo command
+```shell
+> echo done | ignore
+```
+