docs: Fix broken links in README.md

The links in README.md pointed to an outdated link for the contributor guide and to AUTHORS.md instead of AUTHORS.rst

Refs: #5235
Change-Id: I380127d607b52773cc2d4c3020c9ac9950fe6f44
diff --git a/README.md b/README.md
index 02ba988..35e8fb8 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 ========
 
 If you are new to the NDN community of software generally, read the
-[Contributor's Guide](https://github.com/named-data/NFD/blob/master/CONTRIBUTING.md).
+[Contributor's Guide](https://github.com/named-data/.github/blob/master/CONTRIBUTING.md).
 
 ### What is Mini-NDN?
 
@@ -17,7 +17,7 @@
 
 The first release of Mini-NDN is developed by members of the NSF-sponsored NDN project team.
 Mini-NDN is open to contribution from the public.
-For more details, please refer to [AUTHORS.md](AUTHORS.md).
+For more details, please refer to [AUTHORS.rst](AUTHORS.rst).
 Bug reports and feedback are highly appreciated and can be made through our
 [Redmine site](http://redmine.named-data.net/projects/mini-ndn) and the
 [mini-ndn mailing list](http://www.lists.cs.ucla.edu/mailman/listinfo/mini-ndn).