Empty icon
**Describe the requested icon**
I would like an empty icon that uses the same space as the other icons. This can be useful if you want to align text and icon with in a menu for instance. 

**Screenshots**
![image](https://github.com/phosphor-icons/homepage/assets/6698469/541c03e4-c926-4bca-8469-db1cb709bc38)

**Additional context**
There are also other scenarios where this can come handy.
