Integrate the splash page into the general layout

* Cleanup the CSS
* Fix more views then you have fingers and toes
* Introduce position(weight) for sponsor levels
* Fix bootstrap/datatable integration

app/assets/stylesheets/osem-admin.css.scss

@@ -0,0 +1,59 @@
+.flex-col {
+  display: flex;
+  display: -webkit-flex;
+  flex: 1 100%;
+  flex-flow: column nowrap;
+}
+
+.flex-grow {
+  display: flex;
+  -webkit-flex: 2;
+  flex: 2;
+}
+
+.row-flex, .row-flex > div[class*='col-'] {
+  display: -webkit-box;
+  display: -moz-box;
+  display: -ms-flexbox;
+  display: -webkit-flex;
+  display: flex;
+  flex:1 1 auto;
+}
+
+.row-flex-wrap {
+  -webkit-flex-flow: row wrap;
+  align-content: flex-start;
+  flex:0;
+}
+
+.row-flex > div[class*='col-'], .container-flex > div[class*='col-'] {
+  margin:-.2px; /* hack adjust for wrapping */
+}
+
+.nav-header-bigger {
+    font-size: 15px;
+    font-weight: bold;
+    text-transform: uppercase;
+}
+
+.mySidebar {
+  .fa {
+    margin-right: 10px;
+  }
+  hr {
+    margin: 1px;
+  }
+}
+
+.dl-horizontal dt { white-space: normal; }
+
+.table20 {
+  width: 20%;
+}
+
+
+@media only screen and (max-width: 768px) {
+    .mySidebar ul.subNav {
+        display: block;
+    }
+}