feat(gatsby-remark-autolink-headers): Allow `after` option to make icon appear after header text (#19937)
feat(gatsby-remark-autolink-headers): Allow `after` option to make icon appear after header text (#19937)

* Allow `after` option for plugin to make icon appear after header text

* Change prop name to be more explicit

* Revert default to false and remove CHANGELOG as per PR feedback

* Make new prop name more explicit isIconAfterH > isIconAfterHeader

* Update snapshots

* Add tests for new prop

* Address PR feedback by adding clear 'optional' label to prop description

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