Improvements for the updater UI

[Senyoret1]

Did you run make format && make check?
The go code was not changed. npm run lint and npm run build were used.

Changes:

• An option for updating the hypervisor was added to the menu in the visor list.
• An option for configuring the updater was added to the settings page. For accessing it, you must click the "Show updater settings" link at the bottom of the page.

How to test this PR:
Test the hypervisor updater using the option in the visor list. Test the updater settings using the form at the bottom of the settings page.

Note 1: #476 must be solved for the hypervisor update procedure to work totally well.

Note 2: the control for updating the hypervisor has a lot of repeated code from the control for updating a visor. This was made to avoid overcomplicating the control user for updating the visors, as the operation for updating the hypervisor will not be needed after some time.