deleted some useless stuff and backend integration

frontend/src/style/RootContainer.scss

@@ -1,6 +1,6 @@
-@import 'camphor.scss';
-@import 'palette.scss';
-@import 'constants.scss';
+@import './common/font/camphor.scss';
+@import './common/palette.scss';
+@import './common/constants.scss';
 
 body {
   margin: 0;

frontend/src/style/spinner.scss

@@ -1,46 +0,0 @@
-.loader,
-.loader:after {
-  border-radius: 50%;
-  width: 10em;
-  height: 10em;
-}
-
-.loader {
-  margin: 60px auto;
-  font-size: 10px;
-  position: relative;
-  text-indent: -9999em;
-  border-top: 1.1em solid rgba(255, 255, 255, 0.2);
-  border-right: 1.1em solid rgba(255, 255, 255, 0.2);
-  border-bottom: 1.1em solid rgba(255, 255, 255, 0.2);
-  border-left: 1.1em solid #ffffff;
-  -webkit-transform: translateZ(0);
-  -ms-transform: translateZ(0);
-  transform: translateZ(0);
-  -webkit-animation: load8 1.1s infinite linear;
-  animation: load8 1.1s infinite linear;
-}
-
-@-webkit-keyframes load8 {
-  0% {
-    -webkit-transform: rotate(0deg);
-    transform: rotate(0deg);
-  }
-
-  100% {
-    -webkit-transform: rotate(360deg);
-    transform: rotate(360deg);
-  }
-}
-
-@keyframes load8 {
-  0% {
-    -webkit-transform: rotate(0deg);
-    transform: rotate(0deg);
-  }
-
-  100% {
-    -webkit-transform: rotate(360deg);
-    transform: rotate(360deg);
-  }
-}