Collapse whitespace.
npm install @starptech/rehype-minify-whitespaceCollapse whitespace.
Normally, collapses to a single space. If newlines: true,
collapses white-space containing newlines to '\n' instead
of ' '.
```
npm install --save @starptech/rehype-minify-whitespace
##### In
` This and thathtml`Heading
···→ →···foo···→
##### Out
` This and thathtml`Heading
foo
###### node.data.ignore
When this property is true the node is skipped for whitespace handling.
###### node.data.preserveWhitespace
When this property is true` the node is skipped for whitespace handling.
The implementation is a modified version of Rehype rehype-minify-whitespace 2.0.3