fix: Include SDK directory in Docker image

The SDK directory was not being copied to the Docker image, causing
404 errors when accessing /sdk. Added COPY statement to include the
entire sdk/ directory with its subdirectories and downloadable templates.

Also added logo.jpg to the copy list for completeness.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -5,6 +5,10 @@ COPY index.html /usr/share/nginx/html/
 COPY styles.css /usr/share/nginx/html/
 COPY script.js /usr/share/nginx/html/
 COPY logo.png /usr/share/nginx/html/
+COPY logo.jpg /usr/share/nginx/html/
+
+# Copy SDK directory with templates
+COPY sdk/ /usr/share/nginx/html/sdk/
 
 # Copy custom nginx configuration
 COPY nginx-site.conf /etc/nginx/conf.d/default.conf