* Add blockkit
* Use blockkit for header components
* Add get_header_components()
* Add a APP_HOME_VIEWS list to reduce repetition
* Re-add `buttons = Actions()`
bc that merged wrongly somehow
* Remove Question Tags view button
* Switch to blockkit for dashboard view
Also splits get_ticket_status_pie_chart into two functions!
* Add some form of codebase contributing documentation
* Rename helper.py => dashboard.py
* Fix caption for fallback pie image
