Update main.yml

Modernize pages workflow

Merge pull request #5 from nstephenh/Fix-adding-zero

math in parser now assumes 2 operands, create 'implicitMath' for when there's an optional second operand. Prevents 0 triggering a null check and defaulting to 1. Includes unit test.

Merge pull request #4 from nstephenh/Minor-Docs-Fixes

Fix small errors in functions.md

Upgrade dependencies

Improve readability on mobile

- Add xo and r operators

Fix build path

- Make parser case insensitive

Reformat code

- Refactor dicey-math API

Move site into subfolder

Update functions.js