feat(content): add initial homepage content and navigation

This commit introduces the foundational content and navigation for the website's homepage.

- Adds a new navigation menu to the default layout, linking to Services, Projects, and Insights.
- Creates YAML content files for the homepage in both English (en) and Chinese (zh-CN).
- Populates the content with key sections including capabilities, featured projects, and tech stack.

app/utils/navLinks.ts

@@ -0,0 +1,12 @@
+import type {NavigationMenuItem} from "@nuxt/ui";
+
+export const navLinks: NavigationMenuItem[] = [{
+  label: "Services",
+  icon: "mdi:briefcase-outline"
+}, {
+  label: "Projects",
+  icon: "mdi:lightbulb-group-outline"
+}, {
+  label: "Insights",
+  icon: "mdi:brain"
+}]