Docs: add warning for pgsql records ordering

[benkoshy]

Refers to #306 and #546

Placed in prominent section of quick start.

[ddnexus]

@benkoshy I love how it looks, however the Quick Start seems a place a bit too prominent to put it. It seems a bit like a big pharma side effect disclaimer! 😁

What about adding a Troubleshooting page somewhere (maybe just below the How To), and link it at the end of the Quick Start with another nice box and a brief description... linking the Troubleshooting and the How to?

And since the warning and success boxes that you prepared look very appropriate for a problem and solution, we can keep that model in the Troubleshooting page, eventually extracting others common problems from how-to, discussions and issues and populating that page.

Makes sense?

[benkoshy]

• I shortened the character count as well.
• There are many who contributed to this PR - but I've only added @ikanade.

[ddnexus]

Thank you!