Move toy examples to "playground" app #456

Job	Run time
list-examples	3s
check-export (ag_grid_finance)	1m 23s
check-export (azure_auth)	57s
check-export (basic_crud)	1m 2s
check-export (counter)	1m 0s
check-export (customer_data_app)	1m 1s
check-export (dalle)	1m 0s
check-export (data_visualisation)	1m 5s
check-export (flux-fast)	1m 3s
check-export (form-designer)	1m 16s
check-export (github-stats)	1m 6s
check-export (linkinbio)	59s
check-export (local-component)	58s
check-export (nba)	1m 35s
check-export (overkey)	57s
check-export (playground)	1m 10s
check-export (quiz)	1m 14s
check-export (reflexle)	56s
check-export (sales)	59s
check-export (snakegame)	55s
check-export (todo)	57s
check-export (translator)	58s
check-export (traversal)	55s
check-export (twitter)	55s
check-export (upload)	53s
	25m 17s

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