Update Gallus Pub site design and content

- Changed background and text colors in `styles.css` for a refreshed look.
- Updated logo implementation in `index.html` to use an actual image.
- Adjusted social links and opening hours information.
- Added Font Awesome library to the project configuration.
- Included new logo image in the `public` directory.

.idea/Gallus_Pub.iml

@@ -8,5 +8,6 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="font-awesome" level="application" />
   </component>
 </module>