docs: add migration notice and gfxbench deprecation warning

Author: DennisSmolek

README.md

@@ -4,8 +4,16 @@
 [![npm downloads](https://img.shields.io/npm/dm/@pmndrs/detect-gpu.svg)](https://www.npmjs.com/package/@pmndrs/detect-gpu)
 [![gzip size](https://img.badgesize.io/https:/unpkg.com/@pmndrs/detect-gpu/dist/index.mjs?compression=gzip)](https://unpkg.com/@pmndrs/detect-gpu)
 
+> **Migrating from `detect-gpu`?** This package has moved to `@pmndrs/detect-gpu`. Update your imports:
+> ```diff
+> - import { getGPUTier } from 'detect-gpu';
+> + import { getGPUTier } from '@pmndrs/detect-gpu';
+> ```
+
 Classifies GPUs based on their 3D rendering benchmark score allowing the developer to provide sensible default settings for graphically intensive applications. Think of it like a user-agent detection for the GPU but more powerful.
 
+> **Note:** Our benchmark data source ([gfxbench.com](https://gfxbench.com)) stopped updating in December 2025. The current data remains accurate for existing GPUs, but we are exploring alternative data sources for future updates. See [#132](https://github.com/pmndrs/detect-gpu/issues/132) for progress.
+
 ## Demo
 
 [Live demo](https://pmndrs.github.io/detect-gpu/)
@@ -14,10 +22,18 @@ Classifies GPUs based on their 3D rendering benchmark score allowing the develop
 
 By default we use the [UNPKG](https://unpkg.com) CDN to host the benchmark data. If you would like to serve the benchmark data yourself download the required benchmarking data from [benchmarks.tar.gz](https://github.com/pmndrs/detect-gpu/raw/master/benchmarks.tar.gz) and serve it from a public directory.
 
+```sh
+yarn add @pmndrs/detect-gpu
+```
+
 ```sh
 npm install @pmndrs/detect-gpu
 ```
 
+```sh
+pnpm add @pmndrs/detect-gpu
+```
+
 ## Usage
 
 ```ts
@@ -46,7 +62,7 @@ getGPUTier({
   /**
    * URL of directory where benchmark data is hosted.
    *
-   * @default https://unpkg.com/detect-gpu@{version}/dist/benchmarks
+   * @default https://unpkg.com/@pmndrs/detect-gpu@{version}/dist/benchmarks
    */
   benchmarksURL?: string;
   /**