Update link to the app creation documentation

[krassowski]

Reference Issues or PRs

Fixes #354

What does this implement/fix?

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

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jhub-apps-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 1, 2024 7:54am

[aktech]

This looks great, thanks for this @krassowski

Apologies for the delay in getting this in.