src/content was untracked. Start versioning these two hikes' writing
(index.svx, track.gpx, icon.svg) and add a .gitignore that keeps source
photos out (images/, private/, root cover.*) — they're large and get
re-encoded into static assets at build time. Includes the proofreading pass
on both texts (typos, grammar, gender/agreement). Other hikes stay untracked.
