keep using github wiki for now

README.md

@@ -6,6 +6,6 @@ Postal is a complete and fully featured mail server for use by websites & web se
 
 The application has been running in production for us for nearly 6 months and we will be continuing to use it ourselves and support its ongoing development. If you have any questions about getting up and running, just post an issue.
 
-* [Read all documentation](https://postal.readme.io/docs)
-* [Installation docs](https://postal.readme.io/docs/installation-instructions)
-* [FAQs](https://postal.readme.io/docs/faqs), [Features](https://postal.readme.io/docs/features) & [Screenshots](https://postal.readme.io/docs/screenshots)
+* [Read all documentation](https://github.com/atech/postal/wiki)
+* [Installation docs](https://github.com/atech/postal/wiki/Installation)
+* [FAQs](https://github.com/atech/postal/wiki/FAQs), [Features](https://github.com/atech/postal/wiki/Features) & [Screenshots](https://github.com/atech/postal/wiki/Screenshots)