Vulkan for better or worse seems super targeted at AAA gamedevs, here's a probably unfair 1189 line example of how to show a triangle: https://github.com/SaschaWillems/Vulkan/blob/master/examples...
Besides, while the boilerplate for Hello Triangle is indeed very big, it makes a lot of stuff easier to express on top of it. GL may have a much smaller Hello Triangle, but you have a lot less control over it, way too much stuff happens under the hood. And regardless, if all you want is to animate a web page with fish on an aquarium you really should be using GL instead of Vulkan.