* Break out 'Limitations' into separate page
* Add REST API docs
* Restructure commands, functions, and operators refs
* Add placeholder for getting started guide
* Group 'Syntax', 'Metafields', and 'MV fields' under 'Language'
* Add placeholder for Kibana page
* Add link from landing page
* Apply uniform formatting to ACOS, CASE, and DATE_PARSE function refs
* Reword default LIMIT
* Add support for COUNT(*)
* Move 'Commands' and 'Functions and operators' to individual pages
---------
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
I think it's a bit easier to deal with the files this way. They also
make a page per command so it lines up with the files which is nice.
Also I moved some of the examples into the docs. They were mostly there
already, but I linked them.
---------
Co-authored-by: Abdon Pijpelink <abdon.pijpelink@elastic.co>
