chore: add X and Google Analytics pixels to docs site

GA4 wired via integrations.ga4 in docs.json; X pixel loaded via pixels.js
which Mintlify auto-includes on every page.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: greynewell

docs.json

@@ -65,6 +65,11 @@
       "href": "https://dashboard.supermodeltools.com/"
     }
   },
+  "integrations": {
+    "ga4": {
+      "measurementId": "G-TJEXTLZLVL"
+    }
+  },
   "footer": {
     "socials": {
       "x": "https://x.com/supermodeltools",

pixels.js

@@ -0,0 +1,5 @@
+// X (Twitter) Ads Pixel
+!function(e,t,n,s,u,a){e.twq||(s=e.twq=function(){s.exe?s.exe.apply(s,arguments):s.queue.push(arguments);
+},s.version='1.1',s.queue=[],u=t.createElement(n),u.async=!0,u.src='https://static.ads-twitter.com/uwt.js',
+a=t.getElementsByTagName(n)[0],a.parentNode.insertBefore(u,a))}(window,document,'script');
+twq('config','rc58n');