v0.51

• [BUGFIX] Ensure that our splay query cannot fail on DoesNotExist #340
• [BUGFIX] User notifier should only return enabled senders #345
• [CHANGE] Remove ikasan notifier #331
• [CHANGE] Stubs for including extra help information #333
• [CHANGE] Rename "Shard" to "Datasource" #309
• [DOCUMENTATION] Use Github pages for canonical documentation #332
• [IMPROVEMENT] Allow custom proxy for Slack notifier #336
• [INTERNAL] Upgrade to Django 3.2 #338