REFACTOR(repo): simplify project structure

- Move services/nextjs/ to nextjs/
- Move Dockerfile.prod to Dockerfile at root
- Remove deploy/ folder (K8s manifests moved to K3S-HOME/web-apps)
- Remove .gitea/ workflows
- Update GitHub Actions for new structure
- Remove develop branch triggers

nextjs/app/[locale]/page.tsx

@@ -0,0 +1,31 @@
+import Hero from '@/components/landing/hero';
+import About from '@/components/landing/about';
+import Skills from '@/components/landing/skills';
+import Projects from '@/components/landing/projects';
+import Contact from '@/components/landing/contact';
+import GrafanaPage from '@/components/landing/grafana';
+
+export default function Home() {
+  return (
+    <div className="flex flex-col">
+      <div id="hero">
+        <Hero />
+      </div>
+      <div id="about">
+        <About />
+      </div>
+      <div id="skills">
+        <Skills />
+      </div>
+      <div id="projects">
+        <Projects />
+      </div>
+      <div id="monitoring">
+        <GrafanaPage />
+      </div>
+      <div id="contact">
+        <Contact />
+      </div>
+    </div>
+  );
+}