Lab create cosmetic upgrade

This MR is to make the create-lab page a little more satisfying to the human eye. To do so, I:

• Changed (bootstrap) column widths where needed to fit a 12-column style.
• Added a new bootstrap-select dependency to use instead of the old multiselect plugin.
• Changed checkboxes to either be a more modern toggle switch or to be replaced with a select entirely.
• Removed the validation code that was associated to checkboxes.

Old

New