…emplate for testing

…nformation page tweaked

* Replace `pytest` with Django's built-in runner

* Drop whitenoise public directory

* Correctly collect coverage for parallel test runs

* Note why certain fixtures are created with each test

…hortened and migration file regenerated

…d to reflect the InformationPage model changes

…ired to be entered by the user

* Add the Contact Details snippet
   https://jira.ons.gov.uk/browse/CMS-80
* Add a basic table block
* Add the release calendar app with models
* Programmatically create the release calendar index
* Add the basic templates
* Add a base form class for easier validation
* Add icons to the various panels
* Add validation logic
* Update templates
* Add tests
* Expand core tests
* Expand coverage configuration
  adds a few extra files to the ignore.
  and explicitly filters the RemovedInDjango60Warning

* Tidy up based on code review
  * Prevent release calendar page deletion through the UI
  * Move the changes to the release date below contact details
    e.g. https://www.ons.gov.uk/releases/disabilitypaygapsintheuk2014to2023
* Fail if under 90% test coverage

* Comment out the scheduler image

* Remove scheduler from Procfile

* Add skeleton models for Theme / Topic pages
* Add base analysis series and page models
* Use a custom icon for the contact detail snippet
* Update the StreamField block template to pass the block ID to its children
* Set parent/subpage types for the new page models
* Wire in the analysis page template
* Add series functionality (latest/previous releases)
* Add tests and fail if coverage under 90%
* Tidy up based on code review
  * Make the accredited / census blocks separate includes
  * Include changes to release dates when status is confirmed
  * Allow setting the release date when switching to confirmed
  * Only allow release date or text, not both
  * Prevent release calendar page deletion through the UI
  * Move the changes to the release date below contact details
    e.g. https://www.ons.gov.uk/releases/disabilitypaygapsintheuk2014to2023
  * Switch to using a StreamField for the release page related links
  * Disable the "too-few-public-methods" pylint check globally
  * Make the equation/ONS embed check reusable