Add iframe component for signing messages (#25)

Part of https://www.notion.so/Gentx-like-attestation-mechanism-to-add-validators-at-genesis-time-19da6b22d47280ecbf1fe657c241ff59

Co-authored-by: IshaVenikar <ishavenikar7@gmail.com>
Co-authored-by: Shreerang Kale <shreerangkale@gmail.com>
Co-authored-by: AdityaSalunkhe21 <adityasalunkhe2204@gmail.com>
Reviewed-on: LaconicNetwork/laconic-wallet-web#25
Co-authored-by: ishavenikar <ishavenikar@noreply.git.vdb.to>
Co-committed-by: ishavenikar <ishavenikar@noreply.git.vdb.to>

stack/stack-orchestrator/stack/laconic-wallet-web/README.md

@@ -49,6 +49,9 @@ Instructions for running the `laconic-wallet-web` using [laconic-so](https://git
   # WalletConnect project ID, same should be used in the laconic-wallet
   WALLET_CONNECT_ID=
 
+  # Allowed urls is a comma separated list of allowed urls
+  CERC_ALLOWED_URLS=
+
   # Optional
 
   # WalletConnect code for hostname verification
@@ -63,10 +66,6 @@ Instructions for running the `laconic-wallet-web` using [laconic-so](https://git
 
   # RPC endpoint of laconicd node (default: https://laconicd.laconic.com)
   CERC_LACONICD_RPC_URL=
-
-  # Deploy app URL used for checking origin of the messages for auto-sign-in route
-  # Deploy app repo: https://git.vdb.to/cerc-io/snowballtools-base
-  CERC_DEPLOY_APP_URL=
   ```
 
 ## Start the deployment