Add signet and mainnet .env files

.env.mainnet

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+# Mainnet
+
+VITE_NETWORK="bitcoin"
+VITE_PROXY="wss://p.mutinywallet.com"
+VITE_ESPLORA="https://mutiny.mempool.space/api"
+VITE_LSP="https://lsp.voltageapi.com"
+VITE_RGS="https://scorer.mutinywallet.com/v1/rgs/snapshot/"
+# VITE_SELFHOSTED="true" // Removes Mutiny+
+VITE_AUTH="https://auth.mutinywallet.com"
+VITE_SUBSCRIPTIONS="https://subscriptions.mutinywallet.com"
+VITE_STORAGE="https://storage.mutinywallet.com/v2"
+VITE_FEEDBACK="https://feedback.mutinywallet.com"
+VITE_SCORER="https://scorer.mutinywallet.com"
+VITE_PRIMAL="https://primal-cache.mutinywallet.com/api"

.env.signet

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+#SIGNET
+
+VITE_NETWORK="signet"
+VITE_PROXY="wss://p.mutinywallet.com"
+VITE_ESPLORA="https://mutinynet.com/api"
+VITE_LSP="https://signet-lsp.mutinywallet.com"
+VITE_RGS="https://rgs.mutinynet.com/snapshot/"
+# VITE_SELFHOSTED="true" // Removes Mutiny+
+VITE_AUTH="https://auth-staging.mutinywallet.com"
+VITE_SUBSCRIPTIONS="https://subscriptions-staging.mutinywallet.com"
+VITE_STORAGE="https://storage-staging.mutinywallet.com/v2"
+VITE_FEEDBACK="https://feedback-staging.mutinywallet.com"
+VITE_SCORER="https://scorer-staging.mutinywallet.com"
+VITE_PRIMAL="https://primal-cache.mutinywallet.com/api"