docs: add levlaz as a contributor for code

[allcontributors[bot]]

Adds @levlaz as a contributor for code.

This was requested by markphelps in this comment

[skip ci]

[erka]

@markphelps I believe @levlaz is on the list already. #3148

[markphelps]

@markphelps I believe @levlaz is on the list already. #3148

for docs, not code. this adds a new icon 🆕