Define dark variables for dark mode

[yiendos]

We need a central store of our dark variables, that enable our dark mode to operate. As a proof of concept for DOCman for WordPress these variables are defined here:
https://github.com/joomlatools/foliokit/blob/master/code/component/base/resources/assets/scss/admin/_dark_variables.scss#L7

This branch will be used in conjunction with:
joomlatools/joomlatools-framework#401

The framework will pull these variables through, and create the admin-dark and light stylesheets. It will also extend the template.helper.ui to ensure that the correct stylesheet is provided to the user's choice.

[yiendos]

@ercanozkaya whoops this really fell down my to do list, going from memory this worked well. This is about moving dark mode changes to the kodekit level so it's available to Joomla and WordPress.

Associated foliokit changes can be found here:
https://github.com/joomlatools/foliokit/issues/89

[yiendos]

@ercanozkaya cool does this mean that future releases of JT products will be dark mode enabled? Which products would start with the new dark/ light mode approach?

[ercanozkaya]

We would have to implement it and test it in JT products. However since there is too much of a user base to anger with dark mode issues (or simply people resisting to change) I wouldn't bother for now