Changes:
* Refactors the "Getting Started" content down to one page.
* Refactors the README to reduce duplicated content and better mirror
Kibana's.
* Focuses the quick start on time series data, including data streams
and runtime fields.
* Streamlines self-managed install instructions to Docker.
Co-authored-by: debadair <debadair@elastic.co>
Converts the main README file to asciidoc.
Also includes the following changes:
* Mentioning Slack instead of IRC
* Removed mentioning of native java API, HTTP should be used
* Removed java as a installed requirement
