feat: Update hero container and feature card links in homepage

Author: TBXark

content/_index.md

@@ -3,6 +3,7 @@ title: Sphere
 layout: hextra-home
 ---
 
+{{< hextra/hero-container image="images/sphere.png">}}
 {{< hextra/hero-badge link="https://github.com/TBXark" >}}
   <div class="hx:w-2 hx:h-2 hx:rounded-full hx:bg-primary-400"></div>
   <span>Made&nbsp;with&nbsp;love&nbsp;by&nbsp;TBXark</span>
@@ -24,30 +25,37 @@ layout: hextra-home
 <div class="hx:mb-6">
 {{< hextra/hero-button text="Get Started" link="docs/getting-started/quickstart" >}}
 </div>
+{{< /hextra/hero-container >}}
 
 {{< hextra/feature-grid >}}
   {{< hextra/feature-card
     title="Protocol-First Design"
     subtitle="Define once in Protobuf, generate everywhere. Get Go handlers, HTTP routing, client SDKs, and OpenAPI docs from a single source of truth."
+    link="docs/concepts/protocol-and-codegen"
   >}}
   {{< hextra/feature-card
     title="Pragmatic Monolith Template"
     subtitle="Start simple with Gin + Wire + Ent in a single binary. Clean architecture that scales from MVP to microservices when needed."
+    link="docs/concepts/architecture-and-repo"
   >}}
   {{< hextra/feature-card
     title="Complete Code Generation"
     subtitle="Automated toolchain with protoc-gen-sphere ecosystem: server stubs, HTTP routing, field binding, typed errors, and validation."
+    link="docs/components"
   >}}
   {{< hextra/feature-card
     title="Structured Error Handling"
     subtitle="Define error enums in protobuf with automatic HTTP status mapping. Get consistent JSON responses with code, reason, and message."
+    link="docs/guides/error-handling"
   >}}
   {{< hextra/feature-card
     title="Full-Stack Development"
     subtitle="Generate Swagger documentation, TypeScript SDKs, and validation schemas. Bridge backend and frontend with type safety."
+    link="docs/guides/api-definitions"
   >}}
   {{< hextra/feature-card
     title="Developer Experience"
     subtitle="sphere-cli for project scaffolding, Makefile workflows, and clean project structure. Focus on business logic, not boilerplate."
+    link="docs/components/sphere-cli"
   >}}
 {{< /hextra/feature-grid >}}