UI improvements: add version and make the logo go back to the homepage

[williamdes]

Clicking on the logo to go to the homepage is quite normal in most apps, it would be nice to have it Is it also possible to print in some place the version of the webadmin, it is complicated for me to know if it is up to date or cached

[mdecimus]

If you hover over the logo you'll see the current version. At the moment there is no homepage in the webadmin to redirect users to.