Fix the css chunk issue in development and build issue in production.

[imranhsayed]

• Fix the chunk issue in development - Conflicting order issue
  

Mini css extract plugin Issues

• CSS Problem after build, but not in development' environment. (chunk styles [mini-css-extract-plugin] Conflicting order.) gatsbyjs/gatsby#26486

• New version 0.4.2 capture lot of warnings webpack-contrib/mini-css-extract-plugin#250 (comment)

• New version 0.4.2 capture lot of warnings webpack-contrib/mini-css-extract-plugin#250

• You can check to see what is using it by running yarn why mini-css-extract-plugin

• Possible solution to be tested, update the MiniCSSExtract plugin config in gatsby-node.js, as custom config

new MiniCssExtractPlugin({
  ignoreOrder: true,
}),

• Fix the build issue
  

[imranhsayed]

WIP PR