I'm fairly new to Muse and Muse themes, so please forgive me if this is a dumb question. Anyway, I'm using the Artisan template and I want to swap out (obviously) the SVG assets for my own images. When I do this, I'm replacing with a JPG and it is changing every single photo in the template to that image. Why are these called background images, why are they SVG (do my images need to be saved as SVG), and why is my placed JPG blurry when I sized it correctly in Photoshop? What the heck am I doing wrong??