How do I get rid of the “Visit Website” button and the date within
the Lightbox portfolio details? Below is a link to what I am referring to. Thank you!
Thanks for question, really interesting question. On admin panel, tools for this setting not provided, but you can edit file:\wp-content\themes\cobra\includes\gridifier-templates.php Before editing need create backup of this file. This change will impact to all portfolios.
Delete strings as on screenshot http://prntscr.com/3fzaui
Tools for configuring from admin-panel will be added in future.