feat: rework landingpage the main landingpage should be a resource page where I show my free content but also link to my course the course will live on course.mappingwithd3.com and the sales page as well update the homepage to reflect that change show simple geojson map code (might want to add the result as well, maybe as a modal overlay?) Add CTAs for email list with weekly content and course link sidebar is visible further down with more getting started content or explanation about d3