feat: Add `divide` icons by csandman · Pull Request #568 · feathericons/feather

Added 3 division icons (also knows as an obelus). One by itself, one with a circle around it, and one with a square around it. These are meant to compliment the plus, minus, and x icons and fill out the set of math icons.

The shapes are composed the same way as they are in the other math icons, using 1px lines for the points.

Closes #263