docs: Point the contributing guidelines to the .github repository of the organization.

Author: gustavofreze

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
-> Please follow the [contributing guidelines](https://github.com/tiny-blocks/tiny-blocks/blob/main/CONTRIBUTING.md).
+> Please follow the [contributing guidelines](https://github.com/tiny-blocks/.github/blob/main/CONTRIBUTING.md).
 
 ## Summary
 

README.md

@@ -595,5 +595,5 @@ Http Error Handler is licensed under [MIT](LICENSE).
 
 ## Contributing
 
-Please follow the [contributing guidelines](https://github.com/tiny-blocks/tiny-blocks/blob/main/CONTRIBUTING.md) to
+Please follow the [contributing guidelines](https://github.com/tiny-blocks/.github/blob/main/CONTRIBUTING.md) to
 contribute to the project.