README.OE-Core.md: update URLs

Update URLs to what they actually redirect to.

Cc: Quentin Schulz <foss+yocto@0leil.net>
(From OE-Core rev: f788765e1b9832d0da8ec4ce49aa811115864b0e)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ec2131070cae6c3933e5b08986e8245fcd9deb99)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

README.OE-Core

@@ -6,24 +6,24 @@ of OpenEmbedded. It is distro-less (can build a functional image with
 DISTRO = "nodistro") and contains only emulated machine support.
 
 For information about OpenEmbedded, see the OpenEmbedded website:
-    http://www.openembedded.org/
+    https://www.openembedded.org/
 
 The Yocto Project has extensive documentation about OE including a reference manual
 which can be found at:
-    http://yoctoproject.org/documentation
+    https://docs.yoctoproject.org/
 
 
 Contributing
 ------------
 
 Please refer to
-http://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
+https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded
 for guidelines on how to submit patches.
 
 Mailing list:
 
-    http://lists.openembedded.org/mailman/listinfo/openembedded-core
+    https://lists.openembedded.org/g/openembedded-core
 
 Source code:
 
-    http://git.openembedded.org/openembedded-core/
+    https://git.openembedded.org/openembedded-core/