Deploy to itch.io as web game

[JesseRWeigel]

Publish BattleMath on itch.io for free.

Steps:

• Create itch.io page
• Upload build zip
• Set category to "Educational"
• Add screenshots and description
• Tag with "math", "kids", "education", "browser game"

itch.io has a built-in audience of indie game players and supports web games natively.

Acceptance criteria:

• Game playable on itch.io
• Page has screenshots and description