Update write_first_app tutorial (#5332) #4384

Job	Run time
Basic Checks	3m 19s
Unit Tests	9m 4s
Integration Tests (lifecycle)	6m 17s
Integration Tests (pvtdatapurge e2e)	21m 9s
Integration Tests (smartbft)	20m 33s
Integration Tests (raft)	14m 12s
Integration Tests (pvtdata)	12m 9s
Integration Tests (gateway idemix pkcs11 configtx configtxlator)	17m 48s
Integration Tests (discovery gossip devmode pluggable)	8m 33s
Integration Tests (sbe nwo msp)	7m 46s
Integration Tests (ledger)	14m 16s
	2h 15m 6s

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