docs: Add 1.26 symbols index
docs: Add 1.26 symbols index

Distrotech/clutter,Distrotech/clutter,GNOME/clutter,GNOME/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,Distrotech/clutter,GNOME/clutter,GNOME/clutter