docs: website for LiquidJS

docs/source/tutorials/operators.md

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+---
+title: Operators
+---
+
+LiquidJS operators are very simple and different. There're 2 types of operators supported:
+
+* Comparison operators: `==`, `!=`, `>`, `<`, `>=`, `<=`
+* Logic operators: `or`, `and`, `contains`
+
+Thus numerical operators are not supported and you cannot even plus two numbers like this `{% raw %}{{a + b}}{% endraw %}`, instead we need a filter `{% raw %}{{ a | plus: b}}{% endraw %}`. Actually `+` is a valid variable name in LiquidJS.
+
+## Precedence
+
+1. Comparison operators. All comparison operations have the same precedence and higher than logic operators.
+2. Logic operators. All logic operators have the same precedence.
+
+## Associativity
+
+Logic operators are evaluated from right to left, see [shopify docs][operator-order].
+
+[operator-order]: https://help.shopify.com/en/themes/liquid/basics/operators#order-of-operations