docs: Add frontend dependency installation step to deployment guide

When pulling updates from repository, remember to install frontend dependencies:

cd src/frontend && bun install && bun run build

README.md

@@ -273,6 +273,7 @@ Internet
 - HAProxy installed
 - Domain with DNS pointing to server
 
+
 ### Step 1: Build the Application
 
 ```bash
@@ -283,6 +284,10 @@ cd award
 # Install dependencies
 bun install
 
+# Install frontend dependencies
+cd src/frontend
+bun install
+
 # Build frontend (generates static files in src/frontend/build/)
 bun run build
 ```