Update dgraph URL env value in demo steps (#9)

Part of https://www.notion.so/Create-stacks-for-mainnet-1f2a6b22d4728034be4be2c51decf94e

Co-authored-by: IshaVenikar <ishavenikar7@gmail.com>
Reviewed-on: #9
Co-authored-by: ishavenikar <ishavenikar@noreply.git.vdb.to>
Co-committed-by: ishavenikar <ishavenikar@noreply.git.vdb.to>

docs/demo.md

@@ -393,6 +393,12 @@
     next_public_node_addresses: '["http://localhost:26657"]'
     node_rest_endpoint: 'http://localhost:1317'
     next_public_is_http_enabled: true
+
+    # Set network mode to host so that browser app and backend can use the same node localhost RPC URL
+    use_host_network: "host"
+
+    # Set local host URL for dgraph server
+    dgraph_domain: "http://localhost:8080"
     ```
 
 - Set envs:
@@ -400,14 +406,6 @@
   ```bash
   # Set multisig app deployment directory
   export MULTISIG_DEPLOYMENT_DIR=cosmos-multisig-deployment
-  # Set path to custom network JSON file
-  export NETWORK_JSON_PATH=~/cerc/laconicd-stack/config/network.json
-
-  # Set network mode to host so that browser app and backend can use the same node localhost RPC URL
-  export USE_HOST_NETWORK=host
-
-  # Set local host URL for dgraph server
-  export DGRAPH_URL=http://localhost:8080/graphql
   ```
 
 - Run playbook to setup cosmos multisig app