The README had grown into the full documentation. It now opens with a short
why, what and how, shows the screens and ESP Screens in pictures, and keeps
the installation steps. Every card, setting, alert and update detail moves
unchanged to README_EXTENDED.md.
The license now names Max Gramser; the README credits Adrian Kuehlewind's
ESPHome-touch-display-mount, where the first version started. The unused
background images from that project are gone.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>