Added admin interface to manage channels and enabled plugins (#9)

* Added base admin login/logout flows

* Ignore local database

* Channel model

* Admin interface for channels and plugins

* Added database tests along with workflows

* Added some docstrings

* Ignore .coverage file

* Creating plugins docs WIP

* Documentation

* Black everything

* Some documentation

* Coverage for the plugins package as well

* DB Fixes

* Absolute FROM in Dockerfile

* Database and logging fixes

* Slack: Support private channels

* Added pre-commit

* black'd

* Fixed UserQuery.create

* Fixed ChannelPluginQuery.create exists call

* Added ChannelPlugin menu for debugging

* Ignore sqlite databases

* Updated contributing docs

.gitignore

@@ -5,6 +5,7 @@ __pycache__
 *.cert
 .env-local
 test.py
+.coverage
 
 # Distribution
 dist
@@ -12,4 +13,7 @@ dist
 pip-wheel-metadata
 
 # Github Codespaces
-pythonenv3.8
+pythonenv3.8
+
+# Butterrobot
+*.sqlite*