add oauth flows, profile, logout page, and index page

imports/ui/pages/Index/Index.scss

@@ -0,0 +1,58 @@
+@import '../../stylesheets/mixins';
+@import '../../stylesheets/colors';
+
+.Index {
+  padding: 20px;
+  background: $cb-blue;
+  text-align: center;
+  border-radius: 3px;
+  color: #fff;
+
+  img {
+    width: 100px;
+    height: auto;
+  }
+
+  h1 {
+    font-size: 28px;
+  }
+
+  p {
+    font-size: 18px;
+    color: lighten($cb-blue, 25%);
+  }
+
+  > div {
+    display: inline-block;
+    margin: 10px 0 0;
+
+    .btn:first-child {
+      margin-right: 10px;
+    }
+
+    .btn {
+      border: none;
+    }
+
+    .btn:last-child {
+      background: darken($cb-blue, 20%);
+      color: lighten($cb-blue, 30%);
+
+      &:hover {
+        color: #fff;
+      }
+    }
+  }
+}
+
+@include breakpoint(tablet) {
+  .Index {
+    padding: 30px;
+  }
+}
+
+@include breakpoint(desktop) {
+  .Index {
+    padding: 40px;
+  }
+}