OT: How to make a mobile menu?

I have a website using “SlickNav” to generate the mobile menu:

However this tool seems unmaintained and broken.

It seems that I have to redevelop mobile menus from scratch…
Any advises on how to do that without suffering too much?
Could you point me to some tutorials or good templates that I can learn from?
Here is my current website: https://github.com/Waziup/waziup.io/tree/newd


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For tutorials regarding mobile menus etc please use a search engine.