Update Dockerfile

Dockerfile

@@ -83,6 +83,8 @@ RUN chown renderer /var/run/renderd
 RUN echo "LoadModule tile_module /usr/lib/apache2/modules/mod_tile.so" >> /etc/apache2/conf-available/mod_tile.conf
 RUN a2enconf mod_tile
 COPY apache.conf /etc/apache2/sites-available/000-default.conf
+COPY leaflet-demo.html /var/www/html/index.html
+
 USER renderer
 
 # Install PostgreSQL