Notebooker

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* Feature: GridFS document storage in Mongo-backed instances is now sharded if the mongo server supports it.
* Bugfix: None will stop appearing at the top of reports with nbconvert>7.0.0

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* Feature: Reports are now grouped by their containing folder on the main UI.
* Feature: Allow configuring error email addresses and email subject via UI.
* Bugfix: . and .. should now be allowed to be used when specifying the templates directory.
* Bugfix: corrected cron schedule incorrectly shifting back one day upon save.

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* Feature: A new `--readonly-mode` is available for the webapp. This allows users to have an instance of Notebooker which only displays the results of externally-run or scheduler-run reports. See [the docs](https://notebooker.readthedocs.io/en/latest/webapp/webapp.html#read-only-mode) for more details.
* Bugfix: Scheduler-executed reports will now correctly record stdout.
* Bugfix: Pull from current upstream instead of hard-coded origin/master in git backend of webapp.
* Bugfix: Ensure that the hide_code option is consistent when a rerun is executed via the webapp.

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* Feature: Added support for [Reveal.js](https://revealjs.com/) notebook outputs
* Bugfix: Small bugfix for synchronous report execution
* Improvement: Delete functionality in mongo now also deletes files from GridFS

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* Bugfix: The frontend should now show the correct "time since" for non-UTC timezones
* Bugfix: The scheduler now follows UNIX conventions for day-of-week specifications. (72)
* Bugfix: Use Collection.count_documents() for mongo compat
* Improvement: The raw_results will now also display in full screen
* Improvement: Improve setup.cfg for better wheel building
* Improvement: Pin Werkzeug<2.2 since it causes RuntimeErrors
* Improvement: Fix docs regarding setup + yarn bundling

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* Improvement: The results screen has been widened to show as much content as possible (79).
* Bugfix: The delete button will now work on non-first pages for the scheduler and result listings (90).
* Feature: "View fullscreen" button added to all result pages