added reason for why we recommend designing in light mode + plugin link L21-24
removed usage of variables in favor of design tokens, using one term only makes it easier to understand. Variables are one way to use tokens, js properties are a different one. In this section we discuss the core concept so sticking to tokens seems correct.
added short explanation what design tokens are good for
updated example to use only primitives, as we have not introduced component tokens at this point in the docs.
added section about component tokens, as they exist as well