Update index.md

Author: ratulb

docs/index.md

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 ## 🔍 Code Examples
-- [Game of life](game_of_life.md) U+2794
+- [Game of life](game_of_life.md) ➔
  Contains an implementation of [Conway's Game of Life](https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life) cellular automation.