Nik Everett 65d22e7b3a SQL: Update docs (elastic/x-pack-elasticsearch#3386)
* Remove "overview". That is already covered in the index page.
* Write a basic getting started page.
* Fix the CLI startup instructions.

Original commit: elastic/x-pack-elasticsearch@dabe72b5cc
2017-12-20 13:58:32 -05:00
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