Configure the Kuycon by what it is, not where it is plugged in

The panel's 4500x3000 mode, 1.5 scale, and 10-bit request were a rule
for connector DP-2 outright, which handed them to whatever monitor a
stranger's machine had on its most common DisplayPort connector. The
rule is now matched by description, the per-output prefs loop covers
every connector including DP-2, and the displays contract pins the
policy to the description rather than the port.

config/dot/hypr/README.md

@@ -29,7 +29,7 @@ Don't "fix" them.
 | `hyprland.lua` | Entry point. Each `require()` is its own error scope |
 | `prefs.lua` | Reads the settings file the Settings app writes. See below |
 | `env.lua` | Environment. Note the uwsm caveat below |
-| `monitors.lua` | DP-2 geometry, scaling, and the HDR decision |
+| `monitors.lua` | Monitor geometry and scaling (the Kuycon by description), and the HDR decision |
 | `looks.lua` | Colors, blur, glow, shadows, animations, VRR, scanout |
 | `input.lua` | Keyboard/mouse. Click-to-focus, like GNOME |
 | `rules.lua` | Window rules, gaming rules, layer rules for the shell |