Transform(rotate) utility classes

Add in some type of system for quickly rotating elements.

Examples:
```
.rotate-180 {
transform: rotate(180deg);
}
```

```
.rotate--90 {
transform: rotate(-90deg);
}
```

The issue does not name a file, test, or entry point. Start by locating the existing utility-class definitions and their conventions, then add rotation utilities matching the examples; done means positive and negative degree rotations are available through classes such as .rotate-180 and .rotate--90.

Written by the indexing model from the issue text.