feat: docs v2 (#2460)

Co-authored-by: Catalin Pit <catalinpit@gmail.com>

apps/docs/content/docs/developers/index.mdx

@@ -0,0 +1,87 @@
+---
+title: Developer Guide
+description: Integrate Documenso into your applications using the REST API, webhooks, and embedding options.
+---
+
+## Getting Started
+
+<Cards>
+  <Card
+    title="Authentication"
+    description="Get your API key and authenticate requests."
+    href="/docs/developers/getting-started/authentication"
+  />
+  <Card
+    title="First API Call"
+    description="Create and send your first document via the API."
+    href="/docs/developers/getting-started/first-api-call"
+  />
+</Cards>
+
+---
+
+## Integration Options
+
+<Cards>
+  <Card
+    title="API Reference"
+    description="Documents, recipients, fields, templates, and teams."
+    href="/docs/developers/api"
+  />
+  <Card
+    title="Webhooks"
+    description="Receive notifications when documents are signed or updated."
+    href="/docs/developers/webhooks"
+  />
+  <Card
+    title="Embedding"
+    description="Embed signing experiences using direct links or React."
+    href="/docs/developers/embedding"
+  />
+  <Card
+    title="Examples"
+    description="Common integration patterns and workflows."
+    href="/docs/developers/examples"
+  />
+</Cards>
+
+---
+
+## API Base URL
+
+```
+https://app.documenso.com/api/v2
+```
+
+For self-hosted instances, replace with your instance URL:
+
+```
+https://your-instance.com/api/v2
+```
+
+---
+
+## SDKs
+
+Official SDKs are available for multiple languages:
+
+- [TypeScript SDK](https://github.com/documenso/sdk-typescript)
+- [Python SDK](https://github.com/documenso/sdk-python)
+- [Go SDK](https://github.com/documenso/sdk-go)
+
+---
+
+## Looking for Something Else?
+
+<Cards>
+  <Card
+    title="User Guide"
+    description="Send documents using the web application."
+    href="/docs/users"
+  />
+  <Card
+    title="Self-Hosting"
+    description="Deploy your own Documenso instance."
+    href="/docs/self-hosting"
+  />
+</Cards>