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/Poller.js

@@ -23,6 +23,8 @@ class Poller {
     const subscriptions = await subscriptionManager.all();
     for (const s of subscriptions) {
       try {
+        // TODO(eslint): Switch to Promise.all
+        // eslint-disable-next-line no-await-in-loop
         await this.poll(s);
       } catch (e) {
         console.log(`[Poller] Error polling ${s.id}`, e);