Upgrade wagtail version

Author: Iain MacKay

config/settings/base.py

@@ -178,7 +178,7 @@
 
 # Base URL to use when referring to full URLs within the Wagtail admin backend -
 # e.g. in notification emails. Don't include '/admin' or a trailing slash
-BASE_URL = 'http://example.com'
+WAGTAILADMIN_BASE_URL = 'http://example.com'
 
 # WAGTAILIMAGES_IMAGE_MODEL = 'wagtailapiimagerendition.CustomImage'
 WAGTAIL_USAGE_COUNT_ENABLED = True

requirements.txt

@@ -1,5 +1,5 @@
 Django~=4.0
-wagtail~=2.16
+wagtail~=3.0
 psycopg2>=2.8,<2.9
 python-crontab>=2.5,<2.6
 django-cors-headers>=3.5,<3.6