Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/append.md

@@ -1,105 +1,33 @@
-# append
+---
+title: append
+layout: command
+version: 0.59.0
+---
 
 Append a row to the table.
 
+## Signature
+
+```> append (row)```
+
+## Parameters
+
+ -  `row`: the row to append
+
 ## Examples
 
-Given the following text file `cities.txt` containing cities:
-
+Append one Int item
 ```shell
-Canberra
-London
-Nairobi
-Washington
+> [0,1,2,3] | append 4
 ```
 
-And getting back a Nu table:
-
+Append three Int items
 ```shell
-> open cities.txt | lines
-───┬────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
-───┴────────────
+> [0,1] | append [2,3,4]
 ```
 
-Add the city named `Beijing` like so:
-
+Append Ints and Strings
 ```shell
-> open cities.txt | lines | append Beijing
-───┬────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
- 4 │ Beijing
-───┴────────────
+> [0,1] | append [2,nu,4,shell]
 ```
 
-It's not possible to add multiple rows at once, so you'll need to use `append` multiple times:
-
-```shell
-> open cities.txt | lines | append Beijing | append "Buenos Aires"
-───┬──────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
- 4 │ Beijing
- 5 │ Buenos Aires
-───┴──────────────
-```
-
-So far we have been working with a table without a column, which leaves us with plain rows. Let's `wrap` the plain rows into a column called `city` and save it as a json file called `cities.json`:
-
-Before we save, let's check how it looks after wrapping:
-
-```shell
-open cities.txt | lines | wrap city
-───┬────────────
- # │ city
-───┼────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
-───┴────────────
-```
-
-And save:
-
-`> open cities.txt | lines | wrap city | save cities.json`
-
-Since we will be working with rows that have a column, appending like before won't quite give us back what we want:
-
-```shell
-> open cities.json | append Guayaquil
-───┬────────────
- # │ city
-───┼────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
-───┴────────────
-───┬───────────
- 4 │ Guayaquil
-───┴───────────
-```
-
-We append a row literal directly:
-
-```shell
-> open cities.json | append [[city]; [Guayaquil]]
-───┬────────────
- # │ city
-───┼────────────
- 0 │ Canberra
- 1 │ London
- 2 │ Nairobi
- 3 │ Washington
- 4 │ Guayaquil
-───┴────────────
-```