Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/first.md

@@ -1,31 +1,28 @@
-# first
+---
+title: first
+layout: command
+version: 0.59.0
+---
 
-Use `first` to retrieve the first "n" rows of a table. `first` has a required amount parameter that indicates how many rows you would like returned. If more than one row is returned, an index column will be included showing the row number.
+Show only the first number of rows.
+
+## Signature
+
+```> first (rows)```
+
+## Parameters
+
+ -  `rows`: starting from the front, the number of rows to return
 
 ## Examples
 
+Return the first item of a list/table
 ```shell
-> ps | first 1
-─────────┬──────────────────
- pid     │ 14733
- name    │ nu_plugin_core_p
- status  │ Running
- cpu     │ 4.1229
- mem     │ 2.1 MB
- virtual │ 4.8 GB
-─────────┴──────────────────
-
+> [1 2 3] | first
 ```
 
+Return the first 2 items of a list/table
 ```shell
-> ps | first 5
-───┬───────┬──────────────────┬─────────┬──────────┬─────────┬─────────
- # │ pid   │ name             │ status  │ cpu      │ mem     │ virtual
-───┼───────┼──────────────────┼─────────┼──────────┼─────────┼─────────
- 0 │ 14747 │ nu_plugin_core_p │ Running │   3.5653 │  2.1 MB │  4.8 GB
- 1 │ 14735 │ Python           │ Running │ 100.0008 │ 27.4 MB │  5.4 GB
- 2 │ 14734 │ mdworker_shared  │ Running │   0.0000 │ 18.4 MB │  4.7 GB
- 3 │ 14729 │ mdworker_shared  │ Running │   0.0000 │  8.2 MB │  5.0 GB
- 4 │ 14728 │ mdworker_shared  │ Running │   0.0000 │  8.0 MB │  4.9 GB
-───┴───────┴──────────────────┴─────────┴──────────┴─────────┴─────────
+> [1 2 3] | first 2
 ```
+