feat: Support dark mode in login pages (#7420)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/v3/api/apiClient.js

@@ -0,0 +1,6 @@
+import axios from 'axios';
+
+const { apiHost = '' } = window.chatwootConfig || {};
+const wootAPI = axios.create({ baseURL: `${apiHost}/` });
+
+export default wootAPI;