Fixed links in sponsors section

Author: katharinalisalin

docs/insiders/access-management.md

@@ -153,7 +153,7 @@ recommend using the [group] plugin.
 
 See the [getting started guide] for more information.
   [getting started guide]: getting-started.md
-  [built-in plugins]: index.md#built-in-plugins
+  [built-in plugins]: ../plugins/index.md
   [group]: ../plugins/group.md
 
 ### Forking

docs/insiders/getting-started.md

@@ -12,7 +12,7 @@ repository, you need to [become an eligible sponsor] of @squidfunk on GitHub.
   [pip]: #with-pip
   [docker]: #with-docker
   [git]: #with-git
-  [become an eligible sponsor]: index.md#how-to-become-a-sponsor
+  [become an eligible sponsor]: how-to-sponsor.md
 
 ## Requirements
 

docs/insiders/how-to-sponsor.md

@@ -66,7 +66,7 @@ organizations, the opportunity for [logo placement].
 
   [sponsorship private or to make it public]: privacy.md
   [our sponsors]: our-sponsors.md
-  [logo placement]: our-sponsors.md/#our-premium-sponsors
+  [logo placement]: our-sponsors.md/#premium-sponsors
 
 #### News and updates