chore: fix broken link to git contribution guidelines in README.md

so it matches the rest of the structure

README.md

@@ -6,14 +6,14 @@ This repository contains documentation, guides, and reference material.
 
 - **[Contribution guidelines](./contributing/)**  
   Documentation and guides related to infrastructure configuration and best practices.  
-  - [Git](./infrastructure/git.md)  
+  - [Git](./contributing/git.md)  
     Guidelines for contributing using git
 
 - **[Infrastructure](./infrastructure/)**  
   Documentation and guides related to infrastructure configuration and best practices.  
   - [ACME](./infrastructure/acme.md)  
     Documentation of the ACME concept.
-  - [IPV6](./infrastructure/ipv6/ipv6.md)  
+  - [IPV6](./infrastructure/ipv6.md)  
     Documentation of the ipv6 concept.  
 
 - **[Keycloak](./keycloak/)**