doc: update broken links

Signed-off-by: Christian Berendt <berendt@osism.tech>

doc/source/index.rst

@@ -52,17 +52,17 @@ done releases via an Atom feed.
 Use of a specific release in the configuration repository
 =========================================================
 
-The documentation has been moved: https://osism.github.io/docs/guides/upgrade-guides/manager
+The documentation has been moved: https://osism.github.io/docs/guides/configuration-guide/manager#stable-release
 
-How do we release?
-==================
+How we handle releases
+======================
 
-The documentation has been moved: https://osism.github.io/docs/advanced-guides/developer-guide/#how-do-we-release
+The documentation has been moved: https://osism.github.io/docs/guides/other-guides/developer-guide/releases#how-we-handle-releases
 
-How do you do a release?
-========================
+How to make a release
+=====================
 
-The documentation has been moved: https://osism.github.io/docs/advanced-guides/developer-guide/#how-do-you-do-a-release
+The documentation has been moved: https://osism.github.io/docs/guides/other-guides/developer-guide/releases#how-to-make-a-release
 
 Questions & Answers
 ===================