[website] use yarn "classic" and upgrade a few more things

Summary:
Using Debian's "corepack" yarn matches the version used by github (1.22.21), vs
using yarn from the "yarnpkg" package (4.0.2). Hopefully this makes GitHub
happier about deploying the website.

Reviewed By: dulmarod

Differential Revision: D53764236

fbshipit-source-id: bf3357e85b09d3f3a74d9d9896b45158afc2327d

website/README.md

@@ -1,9 +1,12 @@
 # Website
 
-This website is built using Docusaurus 2, a modern static website generator.
+This website is built using Docusaurus 3, a modern static website generator.
 
 ### Installation
 
+NOTE: On Debian, you likely want to use `corepack yarn` (yarn
+"classic") instead of `yarn`, e.g. `corepack yarn start`.
+
 ```
 $ yarn
 ```

website/package.json

@@ -14,16 +14,16 @@
     "@docusaurus/plugin-google-gtag": "^3.1.1",
     "@docusaurus/preset-classic": "^3.1.1",
     "async": "2.6.4",
-    "classnames": "2.2.6",
+    "classnames": "2.5.1",
     "got": "11.8.5",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
-    "react-github-btn": "1.2.0"
+    "react-github-btn": "1.4.0"
   },
   "devDependencies": {
-    "@docusaurus/module-type-aliases": "3.0.0",
-    "@docusaurus/types": "3.0.0",
-    "prettier": "2.2.1"
+    "@docusaurus/module-type-aliases": "3.1.1",
+    "@docusaurus/types": "3.1.1",
+    "prettier": "3.2.5"
   },
   "browserslist": {
     "production": [