Fix Tailwind deprecations

[pedro-santiago]

warn - As of Tailwind CSS v2.2, `lightBlue` has been renamed to `sky`.
warn - Update your configuration file to silence this warning.

warn - As of Tailwind CSS v3.0, `warmGray` has been renamed to `stone`.
warn - Update your configuration file to silence this warning.

warn - As of Tailwind CSS v3.0, `trueGray` has been renamed to `neutral`.
warn - Update your configuration file to silence this warning.

warn - As of Tailwind CSS v3.0, `coolGray` has been renamed to `gray`.
warn - Update your configuration file to silence this warning.

warn - As of Tailwind CSS v3.0, `blueGray` has been renamed to `slate`.
warn - Update your configuration file to silence this warning.

warn - The RTL features in Tailwind CSS are currently in preview.
warn - Preview features are not covered by semver, and may be improved in breaking ways at any time.```

[crynobone]

We will eventually update it when necessary.

[davidhemphill]

This is unavoidable in the current version of Tailwind CSS. Nova uses a custom Tailwind configuration to enable color customizations like the "primary" color and to provide overridable CSS variables. Accessing the Tailwind-provided color scheme triggers this error, even if you're not using the deprecated names at all.