Images and media referenced by the private Copper Chronicle section are no
longer tracked by git. They live at /assets/copper-chronicle/ on the server
(/srv/www/binning.net/assets/) and are managed independently. Updated all
image links in src/private/copper-chronicle to use absolute paths rooted at
/assets/. Added --filter='protect assets/' to all deploy rsync commands to
prevent accidental deletion during deploys.
Moved the Copper Chronicle and resume into a private git submodule
(src/private), visible only to authenticated users. Added a lock symbol
to the mdbook sidebar for restricted sections. Reorganized nginx/nix
configuration files into a dedicated folder. Removed one-line descriptions
from the menu. Reduced custom CSS to better align the main website's theme
with mdbook's native styling. Personalized the index and blog introduction
pages.
