refactor: (losslessly) compress images

[j9t]

Hi—spontaneous PR (working on updates to Imagemin Guard, testing them on somewhat random repos) that includes optimizations and a few savings for this repo’s images:

Compressed docs/google/chrome_scts.png (70.62 KB → 25.51 KB)
Compressed static/img/blackpixel.png (1.02 KB → 0.10 KB)
Compressed static/img/favicon.png (7.88 KB → 3.37 KB)
Compressed static/img/collab-logos/apple.png (0.85 KB → 0.48 KB)
Compressed static/img/collab-logos/censys.png (13.17 KB → 6.85 KB)
Compressed static/img/collab-logos/cloudflare.png (2.01 KB → 1.23 KB)
Compressed static/img/collab-logos/digicert.png (2.20 KB → 1.09 KB)
Compressed static/img/collab-logos/facebook.png (20.40 KB → 6.34 KB)
Compressed static/img/collab-logos/facebook_nocrop.png (7.46 KB → 5.23 KB)
Compressed static/img/collab-logos/google.png (2.78 KB → 1.57 KB)
Compressed static/img/collab-logos/lets-encrypt.png (2.66 KB → 1.24 KB)
Compressed static/img/collab-logos/sectigo.png (2.31 KB → 1.24 KB)

Defensive base compression completed. You saved 79.12 KB.

The compression is lossless. Couldn’t detect any issues (which was the point of my own tests). Offering this if you like the improvements, otherwise feel free to discard!