Upgrade from blur-admin to Anguar 8+

[yanhuiyi]

This may a question or request that's inadequate to put here. However, we use blur-admin in our UI, and now decide to upgrade code to using Angular 8+. Is there a practice I can follow up, or even is it feasible to do so. Ng-admin is Angular 2 by nature, however, to use that means we have to rewrite our business code from scratch, which we can not afford.