Add prompt to get private key

docs/demo.md

@@ -75,9 +75,6 @@
 - Export required env vars:
 
   ```bash
-  # private key of the existing account
-  export PVT_KEY=<private-key-in-hex-format>
-
   # desired key name
   export KEY_NAME=<key-name>
 
@@ -92,6 +89,8 @@
   ansible-playbook -i localhost, -c local ~/cerc/laconicd-stack/playbooks/validator/create-validator.yml
   ```
 
+  - Input private key of the existing account when prompted
+
 - Check the validator list:
 
   ```bash

docs/run-first-validator.md

@@ -83,9 +83,6 @@
 - Update `~/cerc/laconicd-stack/playbooks/first-validator/first-validator-vars.yml` with required values:
 
   ```bash
-  # Use the private key of the existing account that was exported in previous steps
-  pvt_key: "<private-key>"
-
   # Path to the generated mainnet genesis file
   # Use the absolute path of generated output directory in the previous steps
   genesis_file: "<absolute-path-to-generated-output-dir>/genesis.json"
@@ -117,6 +114,8 @@
   ansible-playbook -i localhost, -c local ~/cerc/laconicd-stack/playbooks/first-validator/run-first-validator.yml
   ```
 
+  - Input private key of the existing account that was exported in previous steps when prompted
+
 - Check logs to ensure that node is running:
 
   ```bash

docs/run-validator.md

@@ -74,9 +74,6 @@
 - Export required env vars:
 
   ```bash
-  # Use the private key of the existing account that was exported in previous steps
-  export PVT_KEY=<private-key-in-hex-format>
-
   # desired key name
   export KEY_NAME=<key-name>
 
@@ -91,6 +88,8 @@
   ansible-playbook -i localhost, -c local ~/cerc/laconicd-stack/playbooks/validator/create-validator.yml
   ```
 
+  - Input private key of the existing account that was exported in previous steps when prompted
+
 - Check the validator list:
 
   ```bash