docs: make users install vue too

[brc-dd]

fixes #531

[brc-dd]

Updated the branch.

Context: Vue needs to be explicitly installed when using Yarn v2/v3.

[kiaking]

Thanks! Should we change package manager to be npm 🤔 And then add info box or something to mention about yarn 2/3. We're using pnpm here but... it should work in npm without probrems too so 👀

[brc-dd]

If we merge #707, then also users will need to add vue explicitly (in pnpm/npm too).