feat(projects): add Doinu to the landing

Offline piano-learning PWA (falling notes, learning path, songs, compose your own
melody, MIDI or microphone). Live at endika.github.io/doinu/.

Author: Endika

src/data/projects.ts

@@ -3,6 +3,19 @@ import type { Project } from "../lib/projects";
 export const categoryOrder = ["web apps", "flipper zero", "experiments"];
 
 export const projects: Project[] = [
+  {
+    name: "Doinu",
+    emoji: "🎹",
+    icon: "https://endika.github.io/doinu/favicon.svg",
+    desc: {
+      en: "Offline piano-learning PWA: falling-notes practice, a step-by-step path, scales & songs, and record your own melodies. Play by MIDI or microphone.",
+      es: "PWA offline para aprender piano: práctica con notas que caen, un camino paso a paso, escalas y canciones, y graba tus propias melodías. Toca por MIDI o micrófono.",
+    },
+    url: "https://endika.github.io/doinu/",
+    type: "live",
+    tag: "PWA",
+    category: "web apps",
+  },
   {
     name: "Ekin",
     emoji: "💪",