Back out the website files that belong to another session

My previous commit used `git add -A` and swept in `website/docs.json`
and `website/src/changelog/intro.mdx`, which another session wrote
while I was working. They are not part of the CI change.

This restores both to their state before that commit and leaves the
work on disk, untouched: docs.json is a modified working tree file
again and intro.mdx is untracked again, so whoever wrote them can
commit them with their own message.

Session: ses_fc073cf53ffem2NBtBXPFaCgyF

website/docs.json

@@ -20,33 +20,25 @@
     ]
   },
   "navigation": {
-    "tabs": [
+    "global": {
+      "anchors": [
+        {
+          "anchor": "GitHub",
+          "href": "https://github.com/remorses/gpuix",
+          "icon": "lucide:github"
+        },
+        {
+          "anchor": "npm",
+          "href": "https://www.npmjs.com/package/@gpuix/react",
+          "icon": "lucide:package"
+        }
+      ]
+    },
+    "groups": [
       {
-        "tab": "Docs",
-        "icon": "lucide:book-open",
-        "groups": [
-          {
-            "group": "Overview",
-            "icon": "lucide:home",
-            "pages": ["index"]
-          }
-        ]
-      },
-      {
-        "tab": "Changelog",
-        "icon": "lucide:newspaper",
-        "changelog": "https://github.com/remorses/gpuix",
-        "initialContent": "changelog/intro"
-      },
-      {
-        "tab": "GitHub",
-        "icon": "lucide:github",
-        "href": "https://github.com/remorses/gpuix"
-      },
-      {
-        "tab": "npm",
-        "icon": "lucide:package",
-        "href": "https://www.npmjs.com/package/@gpuix/react"
+        "group": "Overview",
+        "icon": "lucide:home",
+        "pages": ["index"]
       }
     ]
   },

website/src/changelog/intro.mdx

@@ -1,13 +0,0 @@
----
-title: GPUIX changelog
-sidebarTitle: Changelog
-description: Every released version of @gpuix/react and @gpuix/native, generated from the GitHub releases.
----
-
-Every entry below is a **GitHub release** of `@gpuix/react` and `@gpuix/native`.
-Both packages are published together by CI, so a version number always names the
-same commit on both sides of the bridge.
-
-Each release also carries a **prebuilt example app** (`example-chat-<target>`)
-for macOS, Linux, and Windows. Download it from the release page to see the chat
-example run on the GPU without installing Rust.