fix(badges): remove phantom CI badge referencing non-existent workflow

Author: ramtamilselvan

README.md

@@ -7,7 +7,6 @@
 <p align="center">
   <a href="https://crates.io/crates/aethelred"><img src="https://img.shields.io/crates/v/aethelred?style=flat-square&logo=rust" alt="crates.io"></a>
   <a href="https://docs.rs/aethelred"><img src="https://img.shields.io/docsrs/aethelred?style=flat-square" alt="docs.rs"></a>
-  <a href="https://github.com/aethelred-foundation/aethelred-sdk-rs/actions"><img src="https://img.shields.io/github/actions/workflow/status/aethelred/aethelred-sdk-rs/rs-ci.yml?style=flat-square&label=CI" alt="CI"></a>
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-Apache--2.0-blue?style=flat-square" alt="License"></a>
 </p>