[web-client] simple theme: move sources to client/simple/src

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

client/simple/src/less/animations.less

@@ -0,0 +1,19 @@
+.dialog-modal {
+  animation-name: dialogmodal;
+  animation-duration: 0.13s;
+
+  @keyframes dialogmodal {
+    0% {
+      opacity: 0;
+    }
+
+    50% {
+      opacity: 0.5;
+      transform: translate(-50%, -50%) scale(1.05);
+    }
+  }
+}
+
+input.checkbox-onoff[type="checkbox"]::before {
+  transition: left 0.25s;
+}