Settings: its rows in five groups

Settings had grown to 21 rows in one list. It opens on five groups (This
device, Display, GNSS and radio, Network, System); Enter opens one, Back
returns to the groups, and Back from the groups leaves Settings.

SettingsMenu holds the groups and which one is open (host-tested: every
setting is in exactly one group). The guide, the how-tos, the README,
the scripts' messages and the firmware's own name the new paths, such as
"Settings > System > Firmware".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

site/content/guide/basics.md

@@ -42,7 +42,7 @@ Left and right go through every App and wrap around; up and down stay in the col
 
 **An orange dot on an icon** says something is going on in that App: unread messages in IRC, a Track being recorded in GNSS, a Capture running in the LoRa Scanner, a session open in SSH.
 
-If you prefer the list of names the Launcher used to be, **Settings → Launcher** switches between **Grid** and **List**. In the list, a `*` on the right stands for the dot.
+If you prefer the list of names the Launcher used to be, **Settings → Display → Launcher** switches between **Grid** and **List**. In the list, a `*` on the right stands for the dot.
 
 ## The Status Bar
 
@@ -57,7 +57,7 @@ A strip at the top of every screen: the name of the App on the left, and on the
 | bars and `W` | Wi-Fi connected, with its signal; `W?` is searching; `MON` is the Wi-Fi radio in its monitoring mode, which pauses IRC |
 | `SSH` | An [SSH session](/guide/ssh/) is open, whatever App is in front |
 | `VPN` | The [WireGuard tunnel](/guide/vpn/) is wanted; brighter once the server has answered |
-| `DBG` | The Debug Console is switched on (Settings → Debug Console); brighter while a PC is connected to it |
+| `DBG` | The Debug Console is switched on (Settings → System → Debug Console); brighter while a PC is connected to it |
 | `REC` | A GNSS Track is being recorded |
 | `CAP` | A LoRa capture is being recorded |
 | `L` | The radio is listening; it lights up for a moment on each packet. `SW` while a Sweep runs |