feat: 💥 quantity_point does not provide zero() anymore

src/core/include/mp-units/quantity_point.h

@@ -85,12 +85,6 @@ public:
   quantity_type quantity_from_origin_;  // needs to be public for a structural type
 
   // static member functions
-  [[nodiscard]] static constexpr quantity_point zero() noexcept
-    requires requires { quantity_type::zero(); }
-  {
-    return quantity_point(quantity_type::zero());
-  }
-
   [[nodiscard]] static constexpr quantity_point min() noexcept
     requires requires { quantity_type::min(); }
   {