Replaced redux with zustand. Fixed login issue, closes #980.

store/websites.js

@@ -0,0 +1,20 @@
+import create from 'zustand';
+import produce from 'immer';
+
+const store = create(() => ({}));
+
+export function setDateRange(websiteId, dateRange) {
+  store.setState(
+    produce(state => {
+      if (!state[websiteId]) {
+        state[websiteId] = {};
+      }
+
+      state[websiteId].dateRange = { ...dateRange, modified: Date.now() };
+
+      return state;
+    }),
+  );
+}
+
+export default store;