Update zenith stack version (#7)

Part of `Milestone 4 (Staking & Delegation, Lockdrop)`

Co-authored-by: Shreerang Kale <shreerangkale@gmail.com>
Reviewed-on: #7
Co-authored-by: shreerang <shreerang@noreply.git.vdb.to>
Co-committed-by: shreerang <shreerang@noreply.git.vdb.to>

README.md

@@ -93,7 +93,7 @@ The lockdrop simulation validates the Zenith Network's token distribution mechan
 - Set zenith-stack version to use:
 
   ```bash
-  ZENITH_STACK_VERSION=v0.2.11
+  ZENITH_STACK_VERSION=v0.2.13
   ```
 
   Check [releases](https://git.vdb.to/LaconicNetwork/zenith-stack/releases) page for version history.
@@ -106,7 +106,7 @@ The lockdrop simulation validates the Zenith Network's token distribution mechan
   git clone git@git.vdb.to:LaconicNetwork/lockdrop-simulation.git
 
   # Set repo directory path for further usage
-  LOCKDROP_SIMULATION_DIR=$(pwd)/lockdrop-simulation
+  export LOCKDROP_SIMULATION_DIR=$(pwd)/lockdrop-simulation
   ```
 
 - **zenith-stack repository**
@@ -117,7 +117,7 @@ The lockdrop simulation validates the Zenith Network's token distribution mechan
   git clone git@git.vdb.to:LaconicNetwork/zenith-stack.git
 
   # Set repo directory path for further usage
-  ZENITH_STACK_DIR=$(pwd)/zenith-stack
+  export ZENITH_STACK_DIR=$(pwd)/zenith-stack
 
   # Checkout to the required version
   cd $ZENITH_STACK_DIR
@@ -253,7 +253,7 @@ First, create the data directory required for simulation (must be same as the pa
 # Make sure you are in ansible directory
 cd $ZENITH_STACK_DIR/ansible
 
-DATA_DIRECTORY=$(grep 'data_directory:' inventories/development/group_vars/stage1.yml | awk '{print $2; exit}')
+export DATA_DIRECTORY=$(grep 'data_directory:' inventories/development/group_vars/tge.yml | awk '{print $2; exit}')
 mkdir -p $DATA_DIRECTORY
 ```