Missing Documentation about icon type

[MashdorDev]

In the documentation, the Icon type is missing, how to use it, etc.

Keep doing the great work 👍

docs/development.md

Lines 8 to 19 in eca97f1

	### Field Types
	You can define 7 basic input types (text, image, Markdown, number, switch, URL, link), 1 informational type, and 2 composite types (group & repeater).
	* Text
	* Number
	* Image - accessible with `{image.url}` and `{image.alt}`
	* Markdown - accessible with `{@html description.html}` or `{description.markdown}`
	* Switch (true/false)
	* URL
	* Link - accessible with `{link.url}` and `{link.label}`
	* Info (enables writing instructions to CMS users using Markdown)
	* Group (used to group fields together)
	* Repeater (used for content lists)