docs(public_reference): add Guild as a public reference (#6342)

* Adding Guild as public ref

* Adding Guild as public ref

Author: leandrodamascena

README.md

@@ -65,6 +65,7 @@ The following companies, among others, use Powertools:
 * [CyberArk](https://www.cyberark.com/)
 * [Flyweight](https://flyweight.io/)
 * [globaldatanet](https://globaldatanet.com/)
+* [Guild](https://guild.com/)
 * [IMS](https://ims.tech/)
 * [Jit Security](https://www.jit.io/)
 * [LocalStack](https://www.localstack.cloud/)

docs/index.md

@@ -516,6 +516,9 @@ Knowing which companies are using this library is important to help prioritize t
 [**globaldatanet**](https://globaldatanet.com/){target="_blank" rel="nofollow"}
 { .card }
 
+[**Guild**](https://guild.com/){target="_blank" rel="nofollow"}
+{ .card }
+
 [**IMS**](https://ims.tech/){target="_blank" rel="nofollow"}
 { .card }