Add " Interface IP" display capability + More modern CSS style

[benjisho]

Summary

This pull request enhances the tcgui project by adding the capability to display the IP addresses of each interface and updating the CSS to a more modern style.

Changes

1. Interface IP Display:

   • Modified the Flask application to fetch and display IP addresses alongside interface names.
   • Updated the HTML templates to incorporate IP addresses next to interface names in all relevant sections.

2. CSS Update:

   • Updated the CSS to improve the visual style, making it more modern and user-friendly.

Benefits

• Enhanced Usability: Users can now easily see the IP addresses of each network interface directly in the web UI, improving the usability and convenience of the tool.
• Modern Look: The updated CSS provides a cleaner and more modern look, enhancing the overall user experience.

Screenshots

Before:

After:

Testing

• Verified that the IP addresses are correctly fetched and displayed for each interface.
• Confirmed that the updated CSS renders correctly across various browsers.