Change report modal to include category selection in web UI (#17565)

* Change report modal to include category selection in web UI

* Various fixes and improvements

- Change thank you text to be different based on category
- Change starting headline to be different for account and status reports
- Change toggle components to have a checkmark when checked
- Fix report dialog being cut off on small screens
- Fix thank you screen offering mute or block if already muted or blocked
- Refactor toggle components in report dialog into one component

* Change wording on final screen

* Change checkboxes to be square when multiple options are possible

app/javascript/mastodon/reducers/rules.js

@@ -0,0 +1,13 @@
+import { RULES_FETCH_SUCCESS } from 'mastodon/actions/rules';
+import { List as ImmutableList, fromJS } from 'immutable';
+
+const initialState = ImmutableList();
+
+export default function rules(state = initialState, action) {
+  switch (action.type) {
+  case RULES_FETCH_SUCCESS:
+    return fromJS(action.rules);
+  default:
+    return state;
+  }
+}