style: Updates VS Code editor color scheme

- Updates the VS Code settings to customize the color scheme for
  the activity bar and activity bar badge.
- Enhances the visual appearance and user experience of the editor.

.vscode/settings.json

@@ -2,5 +2,14 @@
     "python.envFile": "${workspaceFolder}/.env",
     "python.analysis.extraPaths": [
         "src"
-    ]
+    ],
+    "workbench.colorCustomizations": {
+        "activityBar.activeBackground": "#8dc4ff",
+        "activityBar.background": "#8dc4ff",
+        "activityBar.foreground": "#15202b",
+        "activityBar.inactiveForeground": "#15202b99",
+        "activityBarBadge.background": "#ff007b",
+        "activityBarBadge.foreground": "#e7e7e7"
+    },
+    "peacock.color": "#5aaaff"
 }