If all you want to do is "website design" as in design a page or two or three using html and some graphics and some text, then you don't need a language. OTOH, if you have plans to make your website a provider of content besides just some "pretty screens" then you will need a language of some kind PLUS the ability to write programs using it. Is that what you have in mind?
There are plenty of providers such as your local ISP or hosting companies who provide tools for building a simple website right out of the box without a need for skills of your own. There are NOT that many providing site design & support using languages, since that kind of thing is a very personal project that only you and your closely associated partners can accomplish.
Big difference between the two.