docs(readme): add links

README.md

@@ -40,10 +40,67 @@ BigNumber.from(WAD.mul(2)).rayMul(0.5e27); // WAD
 ## Book
 
 - [Scale-agnostic utilities](#scale-agnostic-utilities)
+  - [min](#min)
+  - [max](#max)
+  - [sum](#sum)
+  - [format](#format)
+  - [toFloat](#toFloat)
+  - [pow10](#pow10)
 - [Scale constants](#scale-constants)
+  - [WAD](#WAD)
+  - [RAY](#RAY)
+  - [PERCENT](#PERCENT)
+  - [HALF_WAD](#HALF_WAD)
+  - [HALF_RAY](#HALF_RAY)
+  - [HALF_PERCENT](#HALF_PERCENT)
 - [Wad-based utilities](#wad-based-utilities)
+  - [wadMul](#wadMul)
+  - [wadDiv](#wadDiv)
+  - [wadAdd](#wadAdd)
+  - [wadSub](#wadSub)
+  - [wadAvg](#wadAvg)
+  - [wadPow](#wadPow)
+  - [wadMulUp](#wadMulUp)
+  - [wadMulDown](#wadMulDown)
+  - [wadDivUp](#wadDivUp)
+  - [wadDivDown](#wadDivDown)
+  - [formatWad](#formatWad)
+  - [toWadFloat](#toWadFloat)
+  - [wadToPercent](#wadToPercent)
+  - [wadToRay](#wadToRay)
+  - [wadToDecimals](#wadToDecimals)
 - [Ray-based utilities](#ray-based-utilities)
+  - [rayMul](#rayMul)
+  - [rayDiv](#rayDiv)
+  - [rayAdd](#rayAdd)
+  - [raySub](#raySub)
+  - [rayAvg](#rayAvg)
+  - [rayPow](#rayPow)
+  - [rayMulUp](#rayMulUp)
+  - [rayMulDown](#rayMulDown)
+  - [rayDivUp](#rayDivUp)
+  - [rayDivDown](#rayDivDown)
+  - [formatRay](#formatRay)
+  - [toRayFloat](#toRayFloat)
+  - [rayToPercent](#rayToPercent)
+  - [rayToWad](#rayToWad)
+  - [rayToDecimals](#rayToDecimals)
 - [Percent-based utilities](#percent-based-utilities)
+  - [percentMul](#percentMul)
+  - [percentDiv](#percentDiv)
+  - [percentAdd](#percentAdd)
+  - [percentSub](#percentSub)
+  - [percentAvg](#percentAvg)
+  - [percentPow](#percentPow)
+  - [percentMulUp](#percentMulUp)
+  - [percentMulDown](#percentMulDown)
+  - [percentDivUp](#percentDivUp)
+  - [percentDivDown](#percentDivDown)
+  - [formatPercent](#formatPercent)
+  - [toPercentFloat](#toPercentFloat)
+  - [percentToWad](#percentToWad)
+  - [percentToRay](#percentToRay)
+  - [percentToDecimals](#percentToDecimals)
 
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