- implement tips on loading screen

- implement centralized sections
- removed react-spinner package

src/styles/global.css

@@ -1,5 +1,3 @@
-@import "~react-loader-spinner/dist/loader/css/react-spinner-loader.css";
-
 :root {
   @apply transition-colors duration-200 ease-in-out;
 }
@@ -39,6 +37,10 @@ section {
   border-color: #eee;
 }
 
+.MuiTooltip-tooltip {
+  font-size: 10px !important;
+}
+
 .spin {
   animation: spin 1s linear infinite;
 }