Upgrade Docusaurus (and plugins) to 2.0.0-beta.15 (#444)

* Upgrade Docusaurus (and plugins) to 2.0.0-beta.15

* Move gtag config out of themeConfig and into preset-classic config

Per: facebook/docusaurus#5832

docusaurus.config.js

@@ -127,10 +127,6 @@ module.exports = {
       facetFilters: [],
       //... other Algolia params
     },
-    gtag: {
-      // You can also use your "G-" Measurement ID here.
-      trackingID: 'G-1851JH9FSR',
-    },
     image: 'https://semgrep.dev/thumbnail.png'
   },
   scripts: [
@@ -153,6 +149,10 @@ module.exports = {
         theme: {
           customCss: require.resolve('./src/css/custom.css'),
         },
+        gtag: {
+          // You can also use your "G-" Measurement ID here.
+          trackingID: 'G-1851JH9FSR',
+        },
       },
     ],
     [

package.json

@@ -14,10 +14,10 @@
     "write-heading-ids": "docusaurus write-heading-ids"
   },
   "dependencies": {
-    "@docusaurus/core": "^2.0.0-beta.7",
-    "@docusaurus/plugin-client-redirects": "^2.0.0-beta.7",
-    "@docusaurus/preset-classic": "^2.0.0-beta.7",
-    "@docusaurus/theme-search-algolia": "^2.0.0-beta.7",
+    "@docusaurus/core": "^2.0.0-beta.15",
+    "@docusaurus/plugin-client-redirects": "^2.0.0-beta.15",
+    "@docusaurus/preset-classic": "^2.0.0-beta.15",
+    "@docusaurus/theme-search-algolia": "^2.0.0-beta.15",
     "@mdx-js/react": "^1.6.21",
     "@svgr/webpack": "^5.5.0",
     "clsx": "^1.1.1",