(Solved) Multilevel tags for Core 1

[fueschgast]

After 4 years on DW I thought it's finally time to fix my tags page. From searching this comm I gathered that it's possible to give a Core 1 layout multilevel tags. Unfortunately that post isn't helpful to me, because
1. The link to the code is dead,
2. I only know HTML & CSS, so I need step-by-step instruction for this layer thing.