gcn-add-page-icon.php: Added example to add/update an emoji page icon to a Notion page.
#921
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Context
⛑️ Ticket(s): https://secure.helpscout.net/conversation/2762766200/73911?viewId=6987275
Summary
Example snippet to show how to set a Notion page icon when adding and updating pages.
Requires the changes in https://github.com/gravitywiz/gc-notion/pull/19 to function but is backwards compatible (e.g. will not break if using an older GCN version).