Different background colour for different kinds of pages (books and verses)
A header / name for each Bhartṛhari verse, that is a short name for it, e.g. “varaṃ parvata-durgeṣu” or whatever. (ASCII would be good, so that it go into the URL, instead of the K-num?)
Someone visiting a K-page (like https://shreevatsa.net/bhartrhari/web/K194.html) or a book page (like https://shreevatsa.net/bhartrhari/web/Ryder.html) should see some explanatory text at the top, saying what this page is about.
Possible additional ideas: