Install xnav by entering the following commands in the terminal:
sudo apt update sudo apt install xnav
Description:
Automatically construct web site navigation links
XNav adds a wrapper with CSS style and top and side navigation bars to a directory tree of XHTML documents. It also provides a mechanism for automatic construction of XHTML documents from user defined XML document types, using user supplied XSL.
Homepage: http://www.wohlberg.net/public/software/xml/xnav/
Version: 0.05-0ubuntu1
Section: universe/utils