Make manual eslint fixes

These are safe fixes, more complicated fixes can be done separately
(just disabled those errors for now).

- Reorder declarations to fix `no-use-before-define`
- Rename parameters for `no-shadow`
- Remove unused parameters, functions, imports
- Switch from `++` and `—` to `+= 1` and `-= 1` for `no-unary`
- Use object spreading instead of parameter reassignment in auth utils
- Use `window.location` instead of `location` global
- Use inline JSX strings instead of unescaped values
-

web/src/app/Notifier.js

@@ -29,7 +29,7 @@ class Notifier {
       icon: logo,
     });
     if (notification.click) {
-      n.onclick = (e) => openUrl(notification.click);
+      n.onclick = () => openUrl(notification.click);
     } else {
       n.onclick = () => onClickFallback(subscription);
     }
@@ -87,7 +87,7 @@ class Notifier {
    * is not supported, see https://developer.mozilla.org/en-US/docs/Web/API/notification
    */
   contextSupported() {
-    return location.protocol === "https:" || location.hostname.match("^127.") || location.hostname === "localhost";
+    return window.location.protocol === "https:" || window.location.hostname.match("^127.") || window.location.hostname === "localhost";
   }
 }