Drzewacz (see Tolkien's Fangorn/Treebeard) is a static web file browser that needs no backend. It uses the json output of "tree" command.
You only ned to put your files into "contents" folder (or replace it with a symlink or whatever) and serve it with anything that can serve static files.
cd contents
tree -fsDJ --timefmt=%s --noreport -o ../assets/dirtree.json