Example configuration for minimal RAM.

[scunningham]

What does this PR do?

Example configuration for minimal footprint.

Why is it important?

Free tier must run Fleet Server in as small of a footprint as possible.

Checklist

• [ x] My code follows the style guidelines of this project
• [ x] I have commented my code, particularly in hard-to-understand areas
• [ x] I have made corresponding changes to the documentation
• [ x] I have made corresponding change to the default configuration files
• [ x] I have added tests that prove my fix is effective or that my feature works
• [x ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

• [ ]

How to test this PR locally

Use config file as a template and start Fleet Server.

[elasticmachine]

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Build stats

• Build Cause: Pull request #240 opened

• Start Time: 2021-04-14T19:27:18.148+0000

• Duration: 5 min 20 sec

• Commit: 38846b0

Test stats 🧪

Test	Results
Failed	0
Passed	69
Skipped	0
Total	69

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