reenabled admin area; outfitted apps.lyric.models w. AbstractBaseUser instead of custom user class; many other fns & several models updated to accomodate, such as set_unusable_password() method to base user model; reset staging db to prepare for refreshed lyric migrations to accomodate for retrofitted pw field

src/core/urls.py

@@ -1,10 +1,10 @@
-# from django.contrib import admin
+from django.contrib import admin
 from django.http import HttpResponse
 from django.urls import include, path
 from apps.dashboard import views as dash_views
 
 urlpatterns = [
-    # path('admin/', admin.site.urls),
+    path('admin/', admin.site.urls),
     path('', dash_views.home_page, name='home'),
     path('apps/dashboard/', include('apps.dashboard.urls')),
     path('apps/lyric/', include('apps.lyric.urls')),