style(vscode): customize activity bar and theme colors

- Add custom color settings for the activity bar to enhance UI
- Introduce a Peacock color for consistent theme customization

.vscode/settings.json

@@ -0,0 +1,11 @@
+{
+    "workbench.colorCustomizations": {
+        "activityBar.activeBackground": "#eee5a7",
+        "activityBar.background": "#eee5a7",
+        "activityBar.foreground": "#15202b",
+        "activityBar.inactiveForeground": "#15202b99",
+        "activityBarBadge.background": "#1fa090",
+        "activityBarBadge.foreground": "#e7e7e7"
+    },
+    "peacock.color": "#e6d97c"
+}