nexusmods-app: add release-note for resetting before upgrading

24.11 has nexusmods-app 0.6.3, while 25.05 currently has 0.7.3.

Unfortunately, nexusmods-app is unable to run when any state from a
version older than 0.7.0 is still present. Therefore users must be
instructed to reset all state before upgrading.

Author: MattSturgeon

doc/redirects.json

@@ -86,6 +86,9 @@
     "index.html#building-a-titanium-app",
     "index.html#emulating-or-simulating-the-app"
   ],
+  "sec-nixpkgs-release-25.05-incompatibilities-nexusmods-app-upgraded": [
+    "release-notes.html#sec-nixpkgs-release-25.05-incompatibilities-nexusmods-app-upgraded"
+  ],
   "sec-nixpkgs-release-25.05-lib": [
     "release-notes.html#sec-nixpkgs-release-25.05-lib"
   ],

doc/release-notes/rl-2505.section.md

@@ -18,6 +18,16 @@
 
 - `titaniumenv`, `titanium`, and `titanium-alloy` have been removed due to lack of maintenance in Nixpkgs.
 
+### NexusMods.App upgraded {#sec-nixpkgs-release-25.05-incompatibilities-nexusmods-app-upgraded}
+
+- `nexusmods-app` has been upgraded from version 0.6.3 to 0.7.3.
+
+  - Before upgrading, you **must reset all app state** (mods, games, settings, etc). NexusMods.App will crash if any state from a version older than 0.7.0 is still present.
+
+  - Typically, you can can reset to a clean state by running `NexusMods.App uninstall-app`. See Nexus Mod's [how to uninstall the app](https://nexus-mods.github.io/NexusMods.App/users/Uninstall) documentation for more detail and alternative methods.
+
+  - This should not be necessary going forward, because loading app state from 0.7.0 or newer is now supported. This is documented in the [0.7.1 changelog](https://github.com/Nexus-Mods/NexusMods.App/releases/tag/v0.7.1).
+
 ## Nixpkgs Library {#sec-nixpkgs-release-25.05-lib}
 
 ### Breaking changes {#sec-nixpkgs-release-25.05-lib-breaking}

nixos/doc/manual/redirects.json

@@ -1922,6 +1922,9 @@
     "index.html#building-a-titanium-app",
     "index.html#emulating-or-simulating-the-app"
   ],
+  "sec-nixpkgs-release-25.05-incompatibilities-nexusmods-app-upgraded": [
+    "release-notes.html#sec-nixpkgs-release-25.05-incompatibilities-nexusmods-app-upgraded"
+  ],
   "sec-nixpkgs-release-25.05-lib": [
     "release-notes.html#sec-nixpkgs-release-25.05-lib"
   ],