Laravel + NGINX CSS/JS 404 not found
I had a similar issue. It seems allright what you have there in the server block.Although you might be better off if you add a proper server name.Check this question and see if it helps. It has to do with the symlink to var/www/html for your crm, if you used one.
Laravel 8 + nginx - app.css and app.js resources from public/ not loading - 404 not found
And if not you could still use the online CDN's from bootstrap.Also in the question.