[FIX JENKINS-12875] Change default crumb name to Jenkins-Crumb

[JENKINS-33972] The REST API URL has been removed to [..]/itemCategories

[JENKINS-33364] Core documentation: Configure System page

[JENKINS-33364] Core documentation: Agent configuration

[JENKINS-33755] Better usage of focus behavior

[FIXED JENKINS-33857] Make initial admin password file end with a newline

This makes it a tiny bit more convenient to `cat` the file and copy the password
to your clipboard.  Previously, the file did not have a line ending, so the
password would run into your shell prompt, making copying the text harder.

[FIXED JENKINS-33774] [FIXED JENKINS-33755] New item option

[FIX JENKINS-33770] Prevent unauthenticated user registration

[FIX JENKINS-33801]

showing label as title element for buttons.
cleaning up: https://github.com/jenkinsci/jenkins/pull/2182

[FIX JENKINS-33804] adding style to banner

[JENKINS-33730] Fix ATH for Jenkins 2.0

Use rerunFailingTestsCount rather than @RandomlyFails

[FIX JENKINS-33828] - setup wizard was modifying the recommended plugin list

[JENKINS-33813] - fix issues when errors happen during setup wizard

These help files can be shown at two different levels in the URL hierarchy:
- /computer/createItem
- /computer/<name>/configure

Therefore a relative URL will not work in all cases.  To link to the desired
pages correctly would probably require using Jelly or code.

the case of: deselect (e.g. click None), Back, install recommended