docs: recommend to start with one container in prod to complete first-time setup.

[mig5]

Just a PR as per invitation, to reflect the discussion at #2943 (reply in thread)

Thanks!

Checklist

• I have read the contributing guidelines.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added or changed the documentation.

[codecov]

Codecov Report

Merging #2945 (bae2cff) into master (2d54490) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2945      +/-   ##
==========================================
+ Coverage   79.73%   79.76%   +0.02%     
==========================================
  Files         113      113              
  Lines        8054     8054              
==========================================
+ Hits         6422     6424       +2     
+ Misses       1226     1223       -3     
- Partials      406      407       +1     

Impacted Files	Coverage Δ
persistence/sql/persister_oauth2.go	80.85% <0.00%> (+0.85%)	⬆️

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[aeneasr]

Thank you so much!

[vinckr]

Hello @mig5
Congrats on merging your first PR in Ory 🎉 !
Your contribution will soon be helping secure millions of identities around the globe 🌏.
As a small token of appreciation we send all our first time contributors a gift package to welcome them to the community.
Please drop me an email to claim your Ory swag!