dns: add yadifa source code link

README.md

@@ -350,7 +350,7 @@ _See also: [awesome-selfhosted/Database Management](https://github.com/awesome-s
 - [NSD](https://www.nlnetlabs.nl/projects/nsd/about/) - Authoritative only, high performance, simple name server. ([Source Code](https://github.com/NLnetLabs/nsd))
 - [PowerDNS](https://www.powerdns.com/) - DNS server with a variety of data storage back-ends and load balancing features. ([Source Code](https://github.com/PowerDNS/pdns))
 - [Unbound](https://nlnetlabs.nl/projects/unbound/about/) - Validating, recursive, and caching DNS resolver. ([Source Code](https://github.com/NLnetLabs/unbound))
-- [Yadifa](http://www.yadifa.eu/) - Lightweight authoritative Name Server with DNSSEC capabilities powering the .eu top-level domain.
+- [Yadifa](https://www.yadifa.eu/) - Lightweight authoritative Name Server with DNSSEC capabilities powering the .eu top-level domain. ([Source Code](https://github.com/yadifa/yadifa))
 
 
 ### DNS - Control Panels