Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/from_csv.md

@@ -0,0 +1,39 @@
+---
+title: from csv
+layout: command
+version: 0.59.0
+---
+
+Parse text as .csv and create table.
+
+## Signature
+
+```> from csv --separator --noheaders```
+
+## Parameters
+
+ -  `--separator {string}`: a character to separate columns, defaults to ','
+ -  `--noheaders`: don't treat the first row as column names
+
+## Examples
+
+Convert comma-separated data to a table
+```shell
+> open data.txt | from csv
+```
+
+Convert comma-separated data to a table, ignoring headers
+```shell
+> open data.txt | from csv --noheaders
+```
+
+Convert comma-separated data to a table, ignoring headers
+```shell
+> open data.txt | from csv -n
+```
+
+Convert semicolon-separated data to a table
+```shell
+> open data.txt | from csv --separator ';'
+```
+