Add production site setup guide and related install scripts

production/electrs-start-liquid

@@ -0,0 +1,22 @@
+#!/usr/local/bin/zsh
+cd /electrs
+source $HOME/.cargo/env
+export PATH=$HOME/.cargo/bin:$PATH
+
+until false
+do
+	cargo run \
+		--release \
+		--features liquid \
+		--bin electrs \
+		-- \
+		-vvv \
+		--address-search \
+		--network liquid \
+		--daemon-dir /elements \
+		--http-addr '[::]:3001' \
+		--monitoring-addr '127.0.0.1:4225' \
+		--cookie 'user:pass' \
+		--precache-scripts $HOME/electrs/contrib/popular-scripts.txt
+	sleep 1
+done