chore: add api v2 draft docs (#4783)

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

docs/api-v2-reference/introduction.mdx

@@ -0,0 +1,14 @@
+---
+title: "API v2 Reference (Draft)"
+icon: "code-compare"
+---
+
+Formbricks offers two types of APIs: the **Public Client API** and the **Management API**. Each API serves a different purpose, has *different* authentication requirements, and provides access to different data and settings.
+
+### API Key Setup
+
+Checkout the [API Key Setup](/api-reference/rest-api) to access the Management APIs with an API Key.
+
+If you’ve forked the collection and are running it, update the `apiKey` and `environmentId` in the collection variables with your values. We also provide post-run scripts to help auto-assign variables when running scripts.
+
+Need more help? Visit our [Website](https://formbricks.com/) or join our [Discord](https://formbricks.com/discord)!

docs/mint.json

@@ -758,9 +758,14 @@
       "url": "development"
     },
     {
-      "name": "API Reference",
+      "name": "API v1 Reference",
       "openapi": "/api-reference/openapi.json",
       "url": "api-reference"
+    },
+    {
+      "name": "API v2 Reference (Draft)",
+      "openapi": "/api-v2-reference/openapi.yml",
+      "url": "api-v2-reference"
     }
   ],
   "topbarCtaButton": {