no issues
- the current combination of size and maxHeight attributes cover most of
the use cases, but not all of them
- this PR makes the size attribute have only named sizes (e.g. 'sm',
'md', 'full' etc.)
- removes the maxHeight attirbute and adds new width and height
attributes
- width and height attributes can be any number (acts as max width and
height in this situtaion) or 'full'
- if size and width/height are both set, width/height should be priority
