Improve the Dashboard/category on Jason's website

The new dashboard/category pages with video card style is ready: https://jasonkwilliamson.com/klaviyo-mastery What's new? Improved login-logout experience, with a new icon indicator when a user is logged in. Final touches on the module pages. Fixed the search/filter features. Fixed the video page issue where, if no videos are available, the Netflix section is hidden. Added login requirement and "buy course" button (to cover edge cases and prevent users from abusing unprotected pages—view first, buy later). Added a new CMS for categories, enabling real-time search and filtering. Improved UI/UX and micro-interaction experiences overall. Enhanced overall website performance.