Revert "Add the golden ratio φ (#40)"

This reverts commit 8bbebc7.

src/Data/Quantity/Math.purs

@@ -33,7 +33,6 @@ module Data.Quantity.Math
   , pi
   , e
   , tau
-  , phi
   ) where
 
 import Prelude
@@ -150,6 +149,3 @@ e = scalar' Decimal.e
 
 tau ∷ Quantity
 tau = scalar' $ Decimal.fromNumber 2.0 * Decimal.pi
-
-phi ∷ Quantity
-phi = (1.0 + (5.0 .^ 0.5)) ./ (2.0)

src/Quantities.purs

@@ -26,7 +26,7 @@ import Data.Quantity (ConversionError(..), Quantity, abs, approximatelyEqual, as
                       sqrt, toScalar, toScalar', toStandard, (.*), (⊕), (⊖), (⊗), (⊘)) as DQ
 import Data.Quantity.Math (acos, acosh, asin, asinh, atan, atan2, atanh, ceil, cos, cosh, e,
                            exp, factorial, floor, gamma, ln, log10, max, max2, mean, min,
-                           min2, modulo, pi, round, sin, sinh, tan, tanh, tau, phi) as DQM
+                           min2, modulo, pi, round, sin, sinh, tan, tanh, tau) as DQM
 import Data.Quantity.Physics (avogadroConstant, electronCharge, electronMass, g0,
                               gravitationalConstant, kB, planckConstant, protonMass,
                               idealGasConstant, speedOfLight, µ0, µB, α, ε0, ℏ) as DQP