* Added "overflow-x" and "overflow-y"

- Having the same properties as overflow but for just the x and y axises
- Usecase being I want my y axis to be scrollable but not my x axis
- E.g a card with a vertical list of items.

* Added "object-fit" utilities

- The CSS object-fit property is used to specify how an <img> or <video> should be resized to fit its container.
- A responsive alternative to using background-img for a resizable fill/fit image.

* Updated documantation for the overflow utilities

- Now includes docs for `overflow-x` and `overflow-y` utilities

* Placeholder shortcode updated

- Can now choose to render an img tag or svg
- The image contains a base64 svg generated within the template
- example shortcode updated to detect, replace and render preview of 'img' tags as well

* New documentaion for Object Fit added

- Documentation added for the 'object-fit' util

* Updated spell checks issues

* Update object-fit.md...