* Restore nullable assocId for SLO

* Fix namespace

* Add changelog note

* Fix changelog

It gets quite fiddly to get this right. The actual metadata (hosted on
the `host` itself) is alreafy correct because the URL generator uses the
'current' entity metadata and current URL. The admin interface of course
presents all entities in one page and hence cannot rely on the current
URL. Therefore we need to override the url host for this specific
display case.

Closes: #1774

* Migrate to super-linter

* Fix css-linter errors

* Fix yaml-linter errors

* Remove unnecessary config

* Change order of the CI-workflow

* Bump nosborn

* docs

* Fix markdown

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Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

* Fix logout completion for SP

Reference parameters need to be explicitely marked as such in the arguments
array when using call_user_func_array().

Fixes the following exception:

SimpleSAML\Error\Exception: Warning - Parameter 1 to SimpleSAML\Auth\Source::completeLogout() expected to be a reference, value given at .../vendor/simplesamlphp/simplesamlphp/src/SimpleSAML/HTTP/RunnableResponse.php:72
Backtrace:
4 .../vendor/simplesamlphp/simplesamlphp/public/_include.php:86 (SimpleSAML_error_handler)
3 [builtin] (call_user_func_array)
2 .../vendor/simplesamlphp/simplesamlphp/src/SimpleSAML/HTTP/RunnableResponse.php:72 (SimpleSAML\HTTP\RunnableResponse::sendContent)
1 .../vendor/symfony/http-foundation/Response.php:394 (Symfony\Component\HttpFoundation\Response::send)
0 .../vendor/simplesamlphp/simplesamlphp/public/module.php:14 (N/A)

* Add note in changelog

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Co-authored-by: Tim van Dijen <tvdijen@gmail.com>

It seems with the addition of twig templates another way to process
these links (or other links) has been started but which is broken. The
original way still remains in the code. Make it clearer which links this
concerns by making the template variable more explicit and remove the
unused tabs code.

Closes: #1770