03 / OPEN THE DOOR

The answer is afterglow.

This is a public puzzle answer for a temporary browser machine. Type:
  sudo su

At the password prompt, type afterglow and press Enter. Characters will not
appear as you type. A root prompt ends with #. You can then open /site:

  cd /site
  nano pages/about.txt
  bash galleries/sunset/show.sh

Use Ctrl+O, Enter to save a page, and Ctrl+X to exit nano. The editor buttons
on a phone send those same keys. Nothing you change here is published;
starting a fresh session restores the original files and guest privileges.

The public content reader in the website menus opens the same published
pages and galleries directly, with no password or terminal required.