Bump webpack-dev-server, @docusaurus/core, @docusaurus/plugin-client-redirects, @docusaurus/preset-classic and @docusaurus/plugin-content-docs in /docs

Bump webpack-dev-server, @docusaurus/core, @docusaurus/plugin-client-redirects, @docusaurus/preset-classic and @docusaurus/plugin-content-docs in /docs #257