Great Hall sample-data demo: notices

BASE. This demo is built on Homepage (https://github.com/gethomepage/homepage),
licensed under the GNU General Public License v3.0. The following files here are
derived from Homepage and are provided under GPL-3.0 (full text: LICENSE-GPL-3.0.txt):
  - homepage.css   (Homepage's compiled stylesheet; the Tailwind CSS it contains is MIT licensed
                    and keeps its own header comment)
  - index.html     (page markup rendered from Homepage, filled with sample data)
Corresponding upstream source: https://github.com/gethomepage/homepage

MY ADDITIONS. custom.css and custom.js are my own theme for Homepage. They load on top of it,
and because they are distributed together with it here they are offered under the same GPL-3.0
terms. demo.js and demo-shim.js only add the local sample-data simulation.

FONTS. Manrope and IBM Plex Mono, SIL Open Font License 1.1 (fonts/OFL-1.1.txt).

ICONS. The Material Design Icons (*.svg) are Apache-2.0 (Pictogrammers). The service logos
(*.png) come from the Dashboard Icons collection (https://github.com/homarr-labs/dashboard-icons,
Apache-2.0). Product names and logos are trademarks of their respective owners, are used only to
identify the services they belong to, and do not imply endorsement.

SAMPLE DATA. Every figure, status and address in this demo is invented. Nothing here connects to
a real system.