Remove create-fixturenet script and use init script from laconicd repo instead (#8)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

Co-authored-by: Adw8 <adwaitgharpure@gmail.com>
Reviewed-on: cerc-io/fixturenet-laconicd-stack#8

stack-orchestrator/compose/docker-compose-fixturenet-laconicd.yml

@@ -2,15 +2,15 @@ services:
   laconicd:
     restart: unless-stopped
     image: cerc/laconicd:local
-    command: ["bash", "/docker-entrypoint-scripts.d/create-fixturenet.sh"]
+    command: ["bash", "/scripts/init.sh"]
     environment:
       TEST_AUCTION_ENABLED: ${TEST_AUCTION_ENABLED:-false}
       TEST_REGISTRY_EXPIRY: ${TEST_REGISTRY_EXPIRY:-false}
       ONBOARDING_ENABLED: ${ONBOARDING_ENABLED:-false}
+      GENESIS_FILE: /var/tmp/genesis.json
     volumes:
       - laconicd-data:/root/.laconicd
       - genesis-config:/var/tmp
-      - ../config/fixturenet-laconicd/create-fixturenet.sh:/docker-entrypoint-scripts.d/create-fixturenet.sh
     ports:
       - "6060"
       - "26657"