Add google analytics (#85)

Resolves DEVRL-697


https://linear.app/matterlabs/issue/DEVRL-697/add-analytics-to-zksync-docs

## List of changes

- Add Google Analytics
  - Analytics is disabled for non-production environments

.github/workflows/deploy-prod.yml

@@ -24,10 +24,6 @@ jobs:
         run: bun install
       - name: "Deploy target: staging"
         run: bun run build
-        # TODO: ask about below
-        # env:
-        #   RUDDERSTACK_WRITE_KEY: "${{ secrets.RUDDERSTACK_WRITE_KEY }}"
-        #   RUDDERSTACK_DATA_PLANE_URL: "${{ secrets.RUDDERSTACK_DATA_PLANE_URL }}"
 
       - uses: matter-labs/action-hosting-deploy@main
         with:

nuxt.config.ts

@@ -1,7 +1,7 @@
 // https://nuxt.com/docs/api/configuration/nuxt-config
 export default defineNuxtConfig({
   extends: [['github:matter-labs/docs-nuxt-template', { install: true }], ['github:zksync-sdk/sdk-docs#staging']],
-  modules: ['@nuxt/content', '@nuxt/ui', '@nuxt/eslint', '@nuxtjs/seo'],
+  modules: ['@nuxt/content', '@nuxt/ui', '@nuxt/eslint', '@nuxtjs/seo', 'nuxt-gtag'],
   site: {
     name: 'zkSync Docs',
     url: process.env.NUXT_SITE_ENV ? 'https://staging-docs.zksync.io' : 'https://docs.zksync.io',
@@ -35,4 +35,11 @@ export default defineNuxtConfig({
     '/zk-stack/concepts': { redirect: '/zk-stack/concepts/transaction-lifecycle' },
     '/zk-stack/running-a-zk-chain': { redirect: '/zk-stack/running-a-zk-chain/locally' },
   },
+  $production: process.env.NUXT_SITE_ENV
+    ? {}
+    : {
+        gtag: {
+          id: 'G-ELFWXSL45V',
+        },
+      },
 });

package.json

@@ -39,6 +39,7 @@
     "@tsparticles/slim": "^3.3.0",
     "@tsparticles/vue3": "^3.0.1",
     "nuxt": "^3.11.2",
+    "nuxt-gtag": "^2.0.6",
     "nuxt-og-image": "^3.0.0-rc.45",
     "rehype-katex": "^7.0.0",
     "remark-math": "^6.0.0",