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Auto-generate markdown command docs (#4451)

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* Finish updating

* a couple improvements

* Update renames

* cleanup examples
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docs/commands/headers.md
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# headers
---
title: headers
layout: command
version: 0.59.0
---
Use `headers` to turn the first row of a table into meaningful column names.
Use the first row of the table as column names.
As demonstrated in the following example, it's particularly handy when working with spreadsheets.
## Signature
```> headers ```
## Examples
Returns headers from table
```shell
> open sample_data.ods | get SalesOrders
────┬────────────┬─────────┬──────────┬─────────┬─────────┬───────────┬───────────
# │ Column0 │ Column1 │ Column2 │ Column3 │ Column4 │ Column5 │ Column6
────┼────────────┼─────────┼──────────┼─────────┼─────────┼───────────┼───────────
0 │ OrderDate │ Region │ Rep │ Item │ Units │ Unit Cost │ Total
1 │ 2018-01-06 │ East │ Jones │ Pencil │ 95.0000 │ 1.9900 │ 189.0500
> "a b c|1 2 3" | split row "|" | split column " " | headers
```
Don't panic on rows with different headers
```shell
> open sample_data.ods | get SalesOrders | headers
────┬────────────┬─────────┬──────────┬─────────┬─────────┬───────────┬───────────
# │ OrderDate │ Region │ Rep │ Item │ Units │ Unit Cost │ Total
────┼────────────┼─────────┼──────────┼─────────┼─────────┼───────────┼───────────
0 │ 2018-01-06 │ East │ Jones │ Pencil │ 95.0000 │ 1.9900 │ 189.0500
1 │ 2018-01-23 │ Central │ Kivell │ Binder │ 50.0000 │ 19.9900 │ 999.4999
> "a b c|1 2 3|1 2 3 4" | split row "|" | split column " " | headers
```