Redirect link from old Importpath Plugin goes to wrong URL

[basicdays]

The URL from https://github.com/esdoc/esdoc-importpath-plugin currently goes to https://github.com/esdoc/esdoc-optional-plugins/tree/master/esdoc-importpath-plugin instead of https://github.com/esdoc/esdoc-plugins/tree/master/esdoc-importpath-plugin.