Remove instructions from readme about customizing files (#487) #377

Job	Run time
amd64 / build-stellar-core	45s
amd64 / build-stellar-friendbot	50s
amd64 / build-stellar-horizon	2m 55s
amd64 / build-stellar-soroban-rpc	54s
arm64 / build-stellar-core	34s
arm64 / build-stellar-friendbot	2m 49s
arm64 / build-stellar-horizon	13m 37s
arm64 / build-stellar-soroban-rpc	48s
amd64 / build	3m 13s
amd64 / test (testnet)	2m 27s
amd64 / push-pr	0s
amd64 / test (pubnet)	1m 44s
amd64 / test (standalone)	1m 44s
amd64 / test (standalone, --enable-horizon-captive-core)	1m 47s
amd64 / push-release	1m 2s
arm64 / build	8m 25s
arm64 / test (testnet)	23m 17s
arm64 / test (pubnet)	1m 27s
arm64 / test (standalone)	1m 54s
arm64 / push-pr	0s
arm64 / test (standalone, --enable-horizon-captive-core)	2m 25s
arm64 / push-release	1m 2s
manifest / push	9s
complete	1s
	1h 13m 49s

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