Add two new brand icons (nlziet, slam)

[zoldev]

I created two new brand icon:
#1176
#1147

[github-actions]

🎨 SVG Normalization Report

✔ Normalization successful.

Please review the normalized icons as errors might occur.
Note that differences in the displayed size are expected (width / height attributes are deleted).

If needed, manually update the PR with a fixed version.

Thank you for your contribution!

Original (PR)	Normalized	Result
		🆕 New · 4872B → 1879B (−2993B, −61.4%)
		🆕 New · 24123B → 14256B (−9867B, −40.9%)