postcss config file modified to process tailwindcss config file

[jgarciallamas]

Hi Chris,

Great course.

This is my first pull request so sorry if there is any mistake. Regarding the modification, I had to modified the postcss config file in order to process the tailwindcss config file because I faced some issues when extending the orange and teal colors. Basically it didn't work so I had to modified the postcss_config.js file.

Thanks again Chris