all updates for Incremental Math

Linear Essence introduction v0.2 • 2025/02/21 February 21, 2025

-Added 1st layer - Linear essence
-Added a guide
-Added 1 row and 1 achievement
-Added 2 rows of Linear upgrades
-Added Linear Equation
-Added Linear Challenges
-Nerfed 2nd and 3rd upgrade cost
-Nerfed x buyable cost in 2nd equation
-Added light and dark mode buttons in options
-Added autosave