move emby-webcomponents to components and reflect paths

src/components/backdrop/style.css

@@ -0,0 +1,29 @@
+.backdropContainer {
+    contain: layout style size;
+}
+
+.backdropImage {
+    background-repeat: no-repeat;
+    background-position: center center;
+    background-size: cover;
+    position: absolute;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    contain: layout style;
+}
+
+.backdropImageFadeIn {
+    animation: backdrop-fadein 800ms ease-in normal both;
+}
+
+@keyframes backdrop-fadein {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}