Implemented customizd scrollbar feature

Refactored the CSS code to introduce a custom scrollbar consistent with modern design trends. The new scrollbar design aligns with the desired appearance, replacing the default one.

Changes Made:
- Added custom scrollbar CSS rules.
- Removed the default scrollbar appearance.

These adjustments have been carefully implemented to maintain the smooth
and polished UI.

Resolves Issue: #327

Signed-off-by: Akhilender <akhilenderb9@gmail.com>

docs/_sass/getnighthawk.scss

@@ -5979,3 +5979,20 @@ div.globalFooterCard.card-environment {
 .accordion-button::after {
   margin-left: 10px !important;
 }
+
+/* Custom Scrollbar*/
+::-webkit-scrollbar{
+  width: 8px;
+}
+::-webkit-scrollbar-track {
+  background-color: #ffffff;
+}
+::-webkit-scrollbar-thumb {
+  background-color: #393E46;
+  border-radius: 12px;
+  box-shadow: inset 0 0 6px rgba(0,0,0,.3);
+  transition: background-color 0.3s ease;
+}
+::-webkit-scrollbar-thumb:hover {
+  background: #555b66;
+}