Fix favicon and meta description

The current web result for miaDash shows empty favicon and uninformative meta description. Check how to add mia logo to favicon and customise meta description.

<img width="1262" height="528" alt="Image" src="https://github.com/user-attachments/assets/c53f4050-b7e3-4eed-a620-7e516d9b1a70" />