Add comments and docstrings to the code

public/static/cookies.js

@@ -1,15 +1,26 @@
-// This function is executed when any page on the website finishes loading and
-// this function retrieves the cookies if it is present on the user's machine.
-// If it is available then the saved cookies is display in the cookies tab
-// otherwise an appropriate message is displayed if it is not available.
+/**
+ * This function is executed when any page on the website finishes loading and
+ * this function retrieves the cookies if it is present on the user's machine.
+ * If it is available then the saved cookies is display in the cookies tab
+ * otherwise an appropriate message is displayed if it is not available.
+ *
+ * @function
+ * @listens DOMContentLoaded
+ * @returns {void}
+ */
 document.addEventListener(
   'DOMContentLoaded',
   () => {
     try {
+      // Decode the cookie value
       let cookie = decodeURIComponent(document.cookie)
+      // Set the value of the input field to the decoded cookie value if it is not empty
+      // Otherwise, display a message indicating that no cookies have been saved on the user's system
       document.querySelector('.cookies input').value =
         cookie !== '' ? cookie : 'No cookies have been saved on your system'
     } catch (error) {
+      // If there is an error decoding the cookie, log the error to the console
+      // and display an error message in the input field
       console.error('Error decoding cookie:', error)
       document.querySelector('.cookies input').value = 'Error decoding cookie'
     }