Add onbtc frontend config, add onbtc backend to build script

production/mempool-frontend-config.onbtc.json

@@ -1,5 +1,4 @@
 {
-  "BASE_MODULE": "bisq",
   "OFFICIAL_MEMPOOL_SPACE": true,
   "TESTNET_ENABLED": true,
   "LIQUID_ENABLED": true,
@@ -10,5 +9,10 @@
   "MEMPOOL_WEBSITE_URL": "https://mempool.space",
   "LIQUID_WEBSITE_URL": "https://liquid.network",
   "BISQ_WEBSITE_URL": "https://bisq.markets",
-  "ITEMS_PER_PAGE": 25
+  "ITEMS_PER_PAGE": 25,
+  "LIGHTNING": true,
+  "ACCELERATOR": true,
+  "PUBLIC_ACCELERATIONS": true,
+  "AUDIT": true,
+  "CUSTOMIZATION": "custom-sv-config.json"
 }