Update Banner image for Kimchi rename

Lise updated the banner image, replacing Burnet with Kimchi.

Signed-off-by: Lise Noble <lwnoble@us.ibm.com>
ui: Disable 'Create' button on create guest without required input

Even if no template selected, the user can try to create a template and
an error message is displayed on the top of the page for some seconds.
Disable the 'Create' button until all required fields be filled and the form
validated

Signed-off-by: Aline Manera <alinefm@br.ibm.com>