docs: upgrade theme to latest (#1220)

Author: jbroma

pnpm-lock.yaml

@@ -13,7 +13,7 @@
     "diff:v3-v4:mjs": "git diff @callstack/repack@3.0.0:templates/webpack.config.mjs HEAD:templates/webpack.config.mjs > src/public/diffs/repack_v3-v4_mjs.diff"
   },
   "dependencies": {
-    "@callstack/rspress-theme": "^0.2.0",
+    "@callstack/rspress-theme": "^0.3.0",
     "@rspress/plugin-llms": "2.0.0-beta.21",
     "rsbuild-plugin-open-graph": "^1.0.2",
     "rspress": "2.0.0-beta.21",