CLASSROOMIO-T-41: Implement dark/light mode switch

Co-authored-by: Rotimi Best <rotimiibitoyeemma@gmail.com>

Merge-request: CLASSROOMIO-MR-8
Merged-by: Digdippa Team <digdippa@gmail.com>

src/components/Tailwindcss.svelte

@@ -57,6 +57,17 @@
       line-height: 1.25 !important;
     }
   }
+  .dark .prose {
+    h1,
+    h2,
+    h3,
+    h4,
+    h5,
+    h6,
+    p {
+      color: #fff;
+    }
+  }
 
   code {
     white-space: pre-wrap;
@@ -74,4 +85,8 @@
   .success :global(svg.carbon-icon) {
     fill: green;
   }
+
+  .dark :global(svg.carbon-icon) {
+    fill: #fff;
+  }
 </style>