Two bugs the deployed branding page surfaced:
1. site-hermes-x/branding/index.html referenced logo/avatar/banner/og/poster
files as same-dir paths, but they actually live in site-hermes-x/assets/.
Rewrite 15 asset refs (src= + href= download links) to ../assets/<name>.
2. The "on sky" mark preview cell used mark.svg (sky-blue), which was
invisible against the sky background. Add mark-dark.svg (same vector,
fills swapped to deep navy) and point the on-sky cell at it.
Also noted during deploy: the on-chain s3 record for hermes.x points to
bns/hermes/ (same convention as [[theseus-x-sia-bucket]]), not bns/hermes.x/.
The VPS systemd sync service was pointing at the wrong bucket and has been
corrected to s3://bns/hermes/.
f6440a28f9
