copy code from PR and update README

data/boltz/boltz.conf

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+[api]
+host = "boltz"
+port = 9_001
+
+[[pairs]]
+base = "BTC"
+quote = "BTC"
+rate = 1
+fee = 0.5
+timeoutDelta = 1_440
+
+[[currencies]]
+symbol = "BTC"
+network = "bitcoinRegtest"
+minWalletBalance = 10_000_000
+minChannelBalance = 10_000_000
+maxSwapAmount = 4_294_967
+minSwapAmount = 10_000
+maxZeroConfAmount = 10_000_000
+
+[currencies.chain]
+mempoolSpace = "http://mempool-web:8080/api"
+host = "bitcoind"
+zmqpubrawtx = "tcp://bitcoind:29000"
+zmqpubrawblock = "tcp://bitcoind:29001"
+port = 18_443
+user = "lnbits"
+password = "lnbits"
+
+[currencies.lnd]
+host = "lnd-1"
+port = 10_009
+certpath = "/data/lnd/tls.cert"
+macaroonpath = "/data/lnd/data/chain/bitcoin/regtest/admin.macaroon"

data/electrs/config.toml

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+network="regtest"
+auth="lnbits:lnbits"
+wait_duration="45s"