Remove instructions from readme about customizing files #376

Job	Run time
amd64 / build-stellar-friendbot	59s
amd64 / build-stellar-horizon	3m 4s
amd64 / build-stellar-soroban-rpc	53s
amd64 / build-stellar-core	26s
arm64 / build-stellar-core	23s
arm64 / build-stellar-friendbot	2m 54s
arm64 / build-stellar-horizon	9m 52s
arm64 / build-stellar-soroban-rpc	59s
amd64 / build	3m 54s
amd64 / test (testnet)	2m 12s
amd64 / push-pr	51s
amd64 / test (pubnet)	1m 52s
amd64 / test (standalone)	1m 53s
amd64 / test (standalone, --enable-horizon-captive-core)	1m 49s
amd64 / push-release	0s
arm64 / build	6m 51s
arm64 / push-pr	54s
arm64 / test (testnet)	16m 19s
arm64 / test (pubnet)	1m 13s
arm64 / test (standalone)	1m 47s
arm64 / test (standalone, --enable-horizon-captive-core)	2m 40s
arm64 / push-release	0s
manifest / push	6s
complete	1s
	1h 1m 52s

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