Use centralized code of conduct.

Author: a-feld

.github/pull_request_template.md

@@ -1,4 +1,4 @@
-_Before contributing, please read our [contributing guidelines](https://github.com/newrelic/newrelic-python-agent/blob/main/CONTRIBUTING.rst) and [code of conduct](https://github.com/newrelic/newrelic-python-agent/blob/main/CODE_OF_CONDUCT.md)._
+_Before contributing, please read our [contributing guidelines](https://github.com/newrelic/newrelic-python-agent/blob/main/CONTRIBUTING.rst) and [code of conduct](https://github.com/newrelic/.github/blob/master/CODE_OF_CONDUCT.md)._
 
 # Overview
 Describe the changes present in the pull request

CODE_OF_CONDUCT.md

@@ -7,9 +7,9 @@ How to Contribute
 -----------------
 
 Contributions are always welcome. Before contributing please read the
-`code of conduct <./CODE_OF_CONDUCT.md>`__ and `search the issue tracker <../../issues>`__; your issue may have already been discussed or fixed in `main`. To contribute, `fork <https://help.github.com/articles/fork-a-repo/>`__ this repository, commit your changes, and `send a Pull Request <https://help.github.com/articles/using-pull-requests/>`__.
+`code of conduct <https://github.com/newrelic/.github/blob/master/CODE_OF_CONDUCT.md>`__ and `search the issue tracker <../../issues>`__; your issue may have already been discussed or fixed in `main`. To contribute, `fork <https://help.github.com/articles/fork-a-repo/>`__ this repository, commit your changes, and `send a Pull Request <https://help.github.com/articles/using-pull-requests/>`__.
 
-Note that our `code of conduct <./CODE_OF_CONDUCT.md/>`__ applies to all platforms and venues related to this project; please follow it in all your interactions with the project and its participants.
+Note that our `code of conduct <https://github.com/newrelic/.github/blob/master/CODE_OF_CONDUCT.md>`__ applies to all platforms and venues related to this project; please follow it in all your interactions with the project and its participants.
 
 How to Get Help or Ask Questions
 --------------------------------