Store preferences in local storage

Fixes #2.

package.json

@@ -16,8 +16,7 @@
         "deploy": "grunt deploy"
     },
     "dependencies": {
-        "@fwdekker/template": "^0.0.20",
-        "js-cookie": "^2.2.1"
+        "@fwdekker/template": "^0.0.20"
     },
     "devDependencies": {
         "grunt": "^1.2.1",

src/main/index.html

@@ -47,6 +47,6 @@
     <div id="footer"></div>
 </main>
 
-<script src="bundle.js"></script>
+<script src="bundle.js?v=%%VERSION_NUMBER%%"></script>
 </body>
 </html>

src/main/js/index.js

@@ -1,7 +1,7 @@
 import {$, doAfterLoad, footer, header, nav} from "@fwdekker/template";
-import Cookies from "js-cookie";
 
 
+const storageKey = "/tools/random-fo76//selected-signatures";
 const signatureColCount = 8;
 
 
@@ -43,35 +43,29 @@ const setAllSignatures = checked => {
     const checkboxes = document.querySelectorAll("#signatures input");
     for (let i = 0; i < checkboxes.length; i++)
         checkboxes[i].checked = checked;
-    saveSelectedSignaturesToCookie();
+    saveSelectedSignaturesToStorage();
 
     updateSignatureToggle();
 };
 
 /**
- * (De)selects signatures based on the selection stored in a cookie.
+ * (De)selects signatures based on the selection stored in local storage.
  */
-const loadSelectedSignaturesFromCookie = () => {
-    const cookie = Cookies.get("selectedSignatures");
+const loadSelectedSignaturesFromStorage = () => {
+    const item = localStorage.getItem(storageKey);
     let signatures;
-    if (cookie === undefined)
+    if (item === null)
         signatures = [];
     else
-        signatures = cookie.split(",");
+        signatures = item.split(",");
 
     setSelectedSignatures(signatures);
 };
 
 /**
- * Saves the currently-selected signatures to a cookie.
+ * Saves the currently-selected signatures to local storage.
  */
-const saveSelectedSignaturesToCookie =
-    () => Cookies.set("selectedSignatures", getSelectedSignatures().join(","), {
-        expires: 5 * 365,
-        secure: true,
-        sameSite: "lax",
-        path: ""
-    });
+const saveSelectedSignaturesToStorage = () => localStorage.setItem(storageKey, getSelectedSignatures().join(","));
 
 /**
  * Updates the button used to toggle all signatures on or off.
@@ -145,7 +139,7 @@ const createSignatureButtons = signatures => {
         checkbox.value = signature;
         checkbox.onclick = () => {
             updateSignatureToggle();
-            saveSelectedSignaturesToCookie();
+            saveSelectedSignaturesToStorage();
         };
         col.appendChild(checkbox);
 
@@ -212,7 +206,7 @@ doAfterLoad(() => {
     downloadSignatures(
         signatures => {
             createSignatureButtons(signatures);
-            loadSelectedSignaturesFromCookie();
+            loadSelectedSignaturesFromStorage();
         },
         errorResponse => {
             const form = $("#signatureForm");