docs: Add /healthz/readiness endpoint

[ivov]

Ref n8n-io/n8n#10661

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[github-actions]

Overall readability score: 43.26 (🟢 +0.01)

File	Readability
monitoring.md	61.68 (🟢 +6.37)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
monitoring.md	61.68	50.33	9.35	10.2	11.82	8.03
	🟢 +6.37	🔴 -0.4	🟢 +0.03	🟢 +1.2	🟢 +1.56	🟢 +0.76

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	43.26	34.96	11.66	14.85	14.34	8.53
	🟢 +0.01	🟢 +0	🟢 +0	🟢 +0	🟢 +0	🟢 +0

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

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[freakwriter]

@ivov Thanks for this PR. Can you review the two suggested commits I added? The first is just to make sure the intro includes the new endpoint. The second is to make our linting tool happier by replacing "does not" with "doesn't".

[ivov]

LGTM 👍🏻