Added dummy content and deployment things

src/app/app.css

@@ -0,0 +1,81 @@
+.shell {
+  min-height: 100vh;
+  position: relative;
+}
+
+.content {
+  max-width: 1500px;
+  margin: 0 auto;
+  padding: 1.5rem 1.25rem 4rem;
+}
+
+.sidebar {
+  position: fixed;
+  top: 1.5rem;
+  right: 1.5rem;
+  width: 280px;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  padding: 1.2rem;
+  border: 1px solid #30363d;
+  border-radius: 20px;
+  background: rgba(22, 27, 34, 0.92);
+  backdrop-filter: blur(10px);
+  z-index: 20;
+}
+
+.brand {
+  color: #e6edf3;
+  font-size: 1.05rem;
+  font-weight: 700;
+  letter-spacing: 0.02em;
+  text-decoration: none;
+}
+
+.subtitle {
+  margin: 0;
+  color: #8b949e;
+  font-size: 0.92rem;
+}
+
+.nav {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+}
+
+.nav a {
+  padding: 0.7rem 0.8rem;
+  border: 1px solid transparent;
+  border-radius: 12px;
+  color: #c9d1d9;
+  text-decoration: none;
+  transition: border-color 120ms ease, background-color 120ms ease, color 120ms ease;
+}
+
+.nav a:hover,
+.nav a:focus-visible,
+.nav a.active {
+  border-color: #2f81f7;
+  background: rgba(47, 129, 247, 0.14);
+  color: #ffffff;
+  outline: none;
+}
+
+@media (max-width: 1320px) {
+  .content {
+    max-width: 1040px;
+  }
+
+  .sidebar {
+    position: static;
+    width: auto;
+    margin: 0 1.25rem 1.5rem;
+  }
+
+  .nav {
+    flex-direction: row;
+    flex-wrap: wrap;
+  }
+}