Remove duplicate community health files from this repo (#459)

* The files can be found in the default repository for community files: https://github.com/eiffel-community/.github

 * Part of: eiffel-community/community#13

Author: henning-roos

.github/ISSUE_TEMPLATE.md

@@ -36,7 +36,7 @@ which is a graphical user interface.
 ## About this repository
 The contents of this repository are licensed under the [Apache License 2.0](./LICENSE).
 
-To get involved, please see [Code of Conduct](./CODE_OF_CONDUCT.md) and [contribution guidelines](./CONTRIBUTING.md).
+To get involved, please see [Code of Conduct](https://github.com/eiffel-community/.github/blob/master/CODE_OF_CONDUCT.md) and [contribution guidelines](https://github.com/eiffel-community/.github/blob/master/CONTRIBUTING.md).
 
 ## About Eiffel
 This repository forms part of the Eiffel Community. Eiffel is a protocol for technology agnostic machine-to-machine communication in continuous integration and delivery pipelines, aimed at securing scalability, flexibility and traceability. Eiffel is based on the concept of decentralized real time messaging, both to drive the continuous integration and delivery system and to document it.