Update docs to recommend creating a bind mount for airflow scheduler logs

[greenape]

Closes #3622

I have:

• [ ] Formatted any Python files with black
• [x] Brought the branch up to date with master
• [x] Added any relevant Github labels
• [ ] Added tests for any new additions
• [x] Added or updated any relevant documentation
• [ ] Added an Architectural Decision Record (ADR), if appropriate
• [ ] Added an MPLv2 License Header if appropriate
• [x] Updated the Changelog

Description

Explicitly mentions that a mount should be created for the airflow scheduler logs when deploying FlowETL in the deployment section of the docs, and adds this to the secrets Quickstart.

[cypress[bot]]

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Test summary

43 • 0 • 0 • 0 • 0

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Run details

Project	FlowAuth
Status	Passed
Commit	6c2ee58559
Started	Nov 7, 2022 2:27 PM
Ended	Nov 7, 2022 2:41 PM
Duration	13:50 💡
OS	Linux Debian - 10.5
Browser	Electron 106

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[codecov[bot]]

Codecov Report

Merging #4366 (c23fbcd) into master (c23fbcd) will not change coverage. The diff coverage is n/a.

:exclamation: Current head c23fbcd differs from pull request most recent head 6c2ee58. Consider uploading reports for the commit 6c2ee58 to get more accurate results

@@           Coverage Diff           @@
##           master    #4366   +/-   ##
=======================================
  Coverage   94.22%   94.22%           
=======================================
  Files         269      269           
  Lines       10284    10284           
  Branches      916      916           
=======================================
  Hits         9690     9690           
  Misses        457      457           
  Partials      137      137           

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