You want a favicon to make your homepage look nicer
you can use icotool from icoutils which can convert png to favicons (ico).
apt-get install icoutils
To generate your favicon you use
icotool -c favicon.png -o favicon.ico
Now you include the following line in the head part of your website
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.