Update "powered by" page. (#8761)
Update "powered by" page. (#8761)

+ Add toolchain.
+ Add mediarithmics.
+ Change all http urls to https.

[ci skip]  # Documentation-only change.
benjyw/pants,pantsbuild/pants,jsirois/pants,wisechengyi/pants,tdyas/pants,benjyw/pants,benjyw/pants,wisechengyi/pants,wisechengyi/pants,pantsbuild/pants,tdyas/pants,wisechengyi/pants,jsirois/pants,tdyas/pants,tdyas/pants,tdyas/pants,tdyas/pants,benjyw/pants,wisechengyi/pants,wisechengyi/pants,wisechengyi/pants,wisechengyi/pants,pantsbuild/pants,wisechengyi/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,tdyas/pants,jsirois/pants,tdyas/pants,tdyas/pants,pantsbuild/pants,pantsbuild/pants,pantsbuild/pants