Bring the guides up to date with the code of the last releases (docs only)

README_EXTENDED rendered everything from "Direct control" to "Override YAML" as raw text on
GitHub since 0.2.74: the full-page pictures ended without a blank line. It also gains the
media card, Page buttons, the ··· menu's Identify/Copy/Export/Import, Try it, and where
SCREEN_FIRMWARE_VERSION lives now. EASY_SETUP's settings table drops Show clock and gets
Back to page 1; SETTINGS.md points at web/src/store.ts and packages/core.yaml; GUITION.md
had the GT911 mirrored and cache settings that left the profile on 2026-09-12;
TROUBLESHOOTING still named TILE_COUNT and files deleted in 0.2.50; CALIBRATING put
Calibrate touch in ESP Screens instead of Home Assistant. RELEASING gets the compatibility
notes of 0.2.73 to 0.2.85 and the GitHub release step.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -202,8 +202,9 @@ For Home Assistant OS with Apps/Add-ons on **aarch64 or amd64**:
 </p>
 <p align="center"><sub>New screen (step 3) and choosing your tiles (step 5).</sub></p>
 
-You can install new firmware later from **Firmware & USB → Wi-Fi / OTA** in the sidebar.
-For an existing screen, always use the existing profile; creating a new
+New firmware goes on over Wi-Fi with the **Update** button of a screen in ESP Screens, or by itself
+every night if you turn that on under **Settings**; **Firmware & USB → Wi-Fi / OTA** in the sidebar
+installs it by hand. For an existing screen, always use the existing profile; creating a new
 installation profile generates new keys.
 
 The [complete installation guide](docs/EASY_SETUP.md) walks through every step in more detail.