Revert "Add link to user start page in logo image".
Revert "Add link to user start page in logo image".

Revert "Add link to user start page in logo image" due to performance
penalty.

https://github.com/ManageIQ/manageiq/issues/11664
(transferred from ManageIQ/manageiq@cf877239f29351d17ec543a275c6709d9248b556)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic