New Node: Add okta node doc and update okta credential doc

[ayatnkw]

Related PR: n8n-io/n8n#10278

Changes

• Add app-node page for Okta (previously only available as a credential node)
• Update the Okta credential page to link to the new node doc

Note: Node tier was unclear so used the app-node template and kept it minimal for now.

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[github-actions]

Overall readability score: 42.59 (🔴 -0.01)

File	Readability
n8n-nodes-base.okta.md	20.01 (-)
okta.md	69.55 (🟢 +9.13)

View detailed metrics

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

File	Readability	FRE	GF	ARI	CLI	DCRS
n8n-nodes-base.okta.md	20.01	18.55	15.18	18.6	16.77	10.28
	-	-	-	-	-	-
okta.md	69.55	52.26	7.75	9	10.19	7.79
	🟢 +9.13	🟢 +8.06	🟢 +0.01	🟢 +2.3	🟢 +1.96	🟢 +0.52

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	42.59	34.45	11.73	14.97	14.43	8.58
	🔴 -0.01	🔴 -0.01	🟢 +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

[Joffcom]

Merge on release of 1.55.0