Adds site-theseus-x/extensions/index.html: a public-facing description
of the signed add-on update endpoint (screenshot 0.2.3 currently, more
add-ons as they gain an updateURL). Same visual language as the
theseus.x home page — sticky topnav with the mark, hero, per-extension
cards with the SHA-256 verify block, an operator-key panel, and a
Firefox-XPI-style flow description. Roadmap section flags on-BCNR
pubkey publication and multi-sig as the next security steps.
Content is served from s3://bns/theseus/extensions/index.html; the
Sia autosync mirrors it, so the theseus.x resolver reaches it at
https://navigate.st/bns/theseus.x/extensions/. Landing at
https://theseus.x/extensions on installs whose OS resolver knows the
.x TLD (Ariadne's Thread users, or Theseus's own resolver on internal
navigations).
The specific screenshot 0.2.3 entry it advertises is already live at
https://navigate.st/bns/theseus.x/extensions/screenshot/updates.json;
this page just documents it.
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