core nodes: Use-case and examples for YAML

[ZJvandeWeg]

Use-case and explanation for YAML nodes

Related Issue(s)

Part of: https://github.com/flowforge/content/issues/122

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated

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[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 39.5%, saving 14.18 KB.

Filename	Before	After	Improvement	Visual comparison
src/node-red/core-nodes/images/yaml-node-error.png	12.21 KB	7.31 KB	-40.1%	View diff
src/node-red/core-nodes/images/yaml-node-from-json.png	11.79 KB	7.18 KB	-39.1%	View diff
src/node-red/core-nodes/images/yaml-node-to-json.png	11.91 KB	7.24 KB	-39.2%	View diff

452 images did not require optimisation.

[iskerrett]

This doesn't seem to be rendering correctly for me? When I view it in the deploy preview or locally there are no changes?

[ZJvandeWeg]

Fixed the rendering issue, worked locally as my filesystem doesn't do capital letters.