Enhancement: Add metadata for key docs pages (#116)

project/src/app/docs/all-roadmaps/layout.tsx

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+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "All Roadmaps",
+  description: "Browse all available DemonTech roadmaps. Discover paths for frontend, backend, devops, data science, and more.",
+};
+
+export default function Layout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}

project/src/app/docs/common-questions/layout.tsx

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+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Common Questions",
+  description: "Find answers to frequently asked questions about DemonTech roadmaps, learning paths, and best practices.",
+};
+
+export default function Layout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}

project/src/app/docs/learning-paths/layout.tsx

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+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Learning Paths",
+  description: "Explore structured learning paths to guide your journey from beginner to professional developer.",
+};
+
+export default function Layout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}

project/src/app/docs/quick-start/layout.tsx

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+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Quick Start",
+  description: "Get up and running with DemonTech Roadmap in just a few minutes. Follow simple steps to start your learning journey.",
+};
+
+export default function Layout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}