Werk #13392: GUI: Improve the two-factor authentication (2FA) page

Component	User interface
Title	GUI: Improve the two-factor authentication (2FA) page
Date	Mar 3, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Improve the page's structure, general wording, and error message texts. Also, remove irrelevant page menu entries and add a link to the documentation.

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