Resolve "More gentle handling of accessDenieds"

What does this mr do?

This mr makes sure that when users try to access a lab/course to which they are not enrolled, they will get redirected to the enroll page.

Screenshots

before

displays error message

after

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide. Closes #254 (closed)

CHANGELOG

@@ -5,7 +5,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
 - More TA feedback
 
+### Changed
+ - Unauthorized students for labs/courses now redirects to enroll pages by [@cedricwilleken](https://gitlab.ewi.tudelft.nl/cedricwilleken)
+
 ## [1.0.0] - 2019-10-24
 Initial public release
\ No newline at end of file