Simplify frontend

Just a login form and a list of applications. No modals or anything like
that.

src/browser/pages/app.css

@@ -0,0 +1,24 @@
+/* NOTE: Disable scrollbars since an oversized element creates them. */
+.app-input {
+  height: 100%;
+  left: 0;
+  outline: none;
+  position: fixed;
+  scrollbar-width: none;
+  top: 0;
+  width: 100%;
+  z-index: 20;
+}
+
+.app-input::-webkit-scrollbar {
+  display: none;
+}
+
+.app-render {
+  height: 100%;
+  left: 0;
+  position: fixed;
+  top: 0;
+  width: 100%;
+  z-index: 10;
+}