replace client with client-next

packages/client-next/package.json

packages/client-next/src/lib/canvas.ts

packages/client-next/src/style.scss

packages/client-next/tsconfig.json

packages/client/.nvmrc

packages/client/gulpfile.js

packages/client/package.json

packages/client/postcss.config.js

packages/client/public/index.html

packages/client/src/board.scss

packages/client/src/components/App.tsx

packages/client/src/components/CanvasMeta.tsx

packages/client/src/components/CanvasWrapper.tsx

packages/client/src/components/Header.tsx

packages/client/src/components/Pallete.scss

packages/client/src/components/Pallete.tsx

packages/client/src/contexts/AppContext.tsx

packages/client/src/index.html

packages/client/src/index.ts

packages/client/src/index.tsx