Fix typo on renewal page

Closes #623

See merge request !786

Build and test container in CI

Closes #613

See merge request !781

Improve Thabloid image quality

See merge request !749

Update Album detail title in API

See merge request !780

Fix link to minutes in meetingyear.html

Closes #620

See merge request !783

For tags, we'll also push and tag that container.

Only show cohort when cohort is not None

Closes #552

See merge request !784

Translate 'Notulen' in meetingyear.html

Closes #619

See merge request !782

Add phone and email links to events registrations overview

Closes #617

See merge request !777

Resolve "Set Thalia's theme colour on the address bar"

Closes #568

See merge request !779

Post-process Thabloid pages to stitch spreads together

Closes #599

See merge request !748

Get mailinglist api secret from env variables

See merge request !778

Add sorting to events backend using jQuery tablesorter

Closes #494

See merge request !776

Fix multiple issues with Pizza Events

Closes #606

See merge request !769

Resolve "Sort cancellations by cancel date"

Closes #616

See merge request !771

Fix KeyError in documents package

See merge request !774

Fix AnnualDocument migration

See merge request !772

* Validation did not work for overlapping events
* Validation did not work for start > end
* Allow having consecutive pizza events
* Fix having multiple pizza events in the future

Resolve "Creating an event without specifying time crashes the request"

Closes #609

See merge request !770

Closes #616

Closse #606

Add separate private thumbnails view for API

See merge request !745

Move the email sending to emails.py and add documentation for the entire package

Closes #578

See merge request !739

Hide old boards as organiser for new events

Closes #595

See merge request !752