[FEAT] Replace News and Blog Posts pages by the new degin Material Kit

[csouchet]

See on PR #473 the converted components of Material Kit from JavaScript to TypeScript.

Like:

• https://demos.creative-tim.com/material-kit-pro-react/#/pages/landing-pages/coworking
• https://demos.creative-tim.com/material-kit-react/#/pages/landing-pages/author
• https://demos.creative-tim.com/material-kit-pro-react/#/pages/blogs/single-article