Fixup: Prepare release 5.3.1-rc.1

Restore links modified for pub.dev release

Author: greenrobot-team

objectbox/README.md

@@ -260,8 +260,8 @@ See the [FAQ](https://docs.objectbox.io/faq) and [Troubleshooting](https://docs.
 
 ## See also
 
-- [Changelog](https://pub.dev/packages/objectbox/changelog)
-- [Contribution guidelines](https://github.com/objectbox/objectbox-dart/blob/main/CONTRIBUTING.md)
+- [Changelog](CHANGELOG.md)
+- [Contribution guidelines](../CONTRIBUTING.md)
 
 ## License
 

objectbox/example/README.md

@@ -5,12 +5,12 @@ that uses [Sync](https://objectbox.io/sync/) is available in the objectbox-sync-
 
 There are several example apps and tutorials available in this repository:
 
-* [objectbox_demo_relations](https://github.com/objectbox/objectbox-dart/tree/main/objectbox/example/flutter/objectbox_demo_relations): our main Flutter example app showing 
+* [objectbox_demo_relations](flutter/objectbox_demo_relations): our main Flutter example app showing 
   all basics and how to use relations.
-* [objectbox_demo](https://github.com/objectbox/objectbox-dart/tree/main/objectbox/example/flutter/objectbox_demo): a very basic Flutter example app.
-* [vectorsearch_cities](https://github.com/objectbox/objectbox-dart/tree/main/objectbox/example/dart-native/vectorsearch_cities): a Dart Native example app using Vector
+* [objectbox_demo](flutter/objectbox_demo): a very basic Flutter example app.
+* [vectorsearch_cities](dart-native/vectorsearch_cities): a Dart Native example app using Vector
   Search to find neighbors of cities.
-* [event_management_tutorial](https://github.com/objectbox/objectbox-dart/tree/main/objectbox/example/flutter/event_management_tutorial): an event management Flutter app
+* [event_management_tutorial](flutter/event_management_tutorial): an event management Flutter app
   based on our video tutorial on using relations.
 
 **To learn how to use ObjectBox continue with the [Getting Started](https://docs.objectbox.io/getting-started) guide.**