Add Semantic Gaps to the base framework#91

Would be great if 3 variables are added to the base.
–container-gap
–content-gap
–grid-gap

Using variables for other variables allows “componetize” styles without messing with the elements, in a pretty smart way. It will help to build more maintainable sites.

Could be a situation where you’d need to change all certain gaps in one go, maybe you want them all medium instead of small.

Bricksmaven adds them to the base but is a pity that is not using in the templates to not break the compatibility. Would be nice seen them integrated into the base.

For reference, check the explanation of how they work. https://automaticcss.com/docs/contextual-spacing/