Remove CoreDNS (already listed at awesome-sysadmin) (#3938)

- https://github.com/awesome-foss/awesome-sysadmin#dns---servers

README.md

@@ -755,7 +755,6 @@ _See also: [dbdb.io - Database of Databases](https://dbdb.io/)_
 _See also: [awesome-sysadmin/DNS](https://github.com/awesome-foss/awesome-sysadmin#dns)_
 
 - [blocky](https://github.com/0xERR0R/blocky) - Fast and lightweight DNS proxy (like Pi-hole) as ad-blocker for local network with many features. `Apache-2.0` `Go`
-- [CoreDNS](https://coredns.io/) - Plugin driven DNS Server with support for proxying to Google's DNS-over-HTTPS. ([Source Code](https://github.com/coredns/coredns)) `Apache-2.0` `Go`
 - [Maza ad blocking](https://maza-ad-blocking.andros.dev/) - Local ad blocker. Like Pi-hole but local and using your operating system. ([Source Code](https://github.com/tanrax/maza-ad-blocking)) `Apache-2.0` `Bash`
 - [nsupdate.info](https://www.nsupdate.info/) - Dynamic DNS service. ([Demo](https://www.nsupdate.info/account/register/), [Source Code](https://github.com/nsupdate-info/nsupdate.info)) `BSD-3-Clause` `Python`
 - [SmartDNS](https://github.com/pymumu/smartdns) - A local DNS server to obtain the fastest website IP for the best Internet experience, supports DoT, DoH. `GPL-3.0` `C`