feat(tailwind): update default configuration

[mbasadi]

Default configuration throws the following warnings:

warn - The `purge`/`content` options have changed in Tailwind CSS v3.0.
warn - Update your configuration file to eliminate this warning.
warn - https://tailwindcss.com/docs/upgrade-guide#configure-content-sources

warn - The `content` option in your Tailwind CSS configuration is missing or empty.
warn - Configure your content sources or your generated CSS will be missing styles.
warn - https://tailwindcss.com/docs/content-configuration

warn - The `darkMode` option in your Tailwind CSS configuration is set to `false`, which now behaves the same as `media`.
warn - Change `darkMode` to `media` or remove it entirely.
warn - https://tailwindcss.com/docs/upgrade-guide#remove-dark-mode-configuration