Yes, I just did a quick search and found they were planning to support webp... I don't know why it didn't show for you. Anyway, I've changed the images to jpg and png anyway, just in case.
Not seeing a login button was my intention. If you're already logged in, you don't need to see the button. When you saw it and then it disappeared, that was because... well, the same thing, the button is on the page, but as you're logged in already, it's hidden.
And thanks for the name suggestion. I'll keep it mind. I was thinking about maybe something with 'overview' in it... The idea is/was to give an overview of a bunch of profiles to quickly see which profiles have pictures, stickers, categories, project boxes, and so on. I realised yesterday that I could add the bios and sources without too much difficulty, and I felt it became... bigger(?) with those added. Without them, you'll want to go to many profile pages to look at them, but now it's all there on one page, so it's more convenient...
Anyway... thanks for your help with this.