feat(gatsby-link): allow number type argument of navigate & withPrefix

[wonism]

Description

It should be good if navigate allows number as its argument.
With this, developer doesn't need to use window.history.go(-1);. can use just navigate(-1);.

Implementation of navigate in @reach/router looks like below.

    navigate(to, { state, replace = false } = {}) {
      if (typeof to === "number") {
        source.history.go(to);
      } else {
        ...
      }
    }

Documentation

n/a

Related Issues

n/a

[wonism]

any feedback?

[LekoArts]

This got implemented in #25611