add button to set default colors

src/admin.js

@@ -150,6 +150,19 @@ document.addEventListener('DOMContentLoaded', () => {
         saveSettings(0)
     })
 
+    const resets = document.querySelectorAll('.btn-reset')
+
+    for (let btn of resets) {
+        btn.addEventListener('click', (event) => {
+            const target = event.target
+            const values = JSON.parse(target.getAttribute('data-reset'))
+
+            for (let i in values) {
+                document.querySelector(`#${i}`).value = values[i]
+            }
+        })
+    }
+
     const displays = document.querySelectorAll('.side-menu-display')
 
     for (let display of displays) {