Remove code of conduct document

This patchset removes the CODE_OF_CONDUCT document from this
project because it is superseded by OpenStack governance policies.
Furthermore, having a third-party code of conduct is no longer necessary
as OpenStack's governance guidelines are sufficient.

Also removes the github artifactories under .github because
the code review workflow is now under review.openstack.org.

Change-Id: Ia6b50ef0fb6a03174c8a7b5d762e0540254f1cea

.github/ISSUE_TEMPLATE.md

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-<!-- Thanks for filing an issue! Before submitting your issue, please answer the following questions.-->
-
-**Is this a bug report or feature request?** (choose one):
-
-<!--
-If this is a BUG REPORT, please:
-  - Fill in as much of the template as possible.  If you leave out
-    information, we may automatically close out your pull request.
-
-If this is a FEATURE REQUEST, please:
-  - Describe *in detail* the feature/behavior/change you'd like to see.
-
-Detailed responses allow our community to address your concerns in a timely manner.
-If we can't determine what you're asking for, we may close your issue.  If you feel
-we haven't adequately addressed your issue, please feel free to reopen your issue
-and explain your issue in more detail.
--->
-
-**Python Version** (output of `python --version`):
-
-**Development or Deployment Environment?**:
-
-**Release Tag or Master**:
-
-**Expected Behavior**:
-
-**What Actually Happened**:
-
-**How to Reproduce the Issue** (as minimally as possible):
-
-**Any Additional Comments**:

.github/PULL_REQUEST_TEMPLATE.md

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-<!--
-      Thanks for contributing to Armada!  Please be thorough
-      when filling out your pull request. If the purpose for your pull
-      request is not clear, we may close your pull request and ask you
-      to resubmit.
--->
-
-**What is the purpose of this pull request?**:
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-**What issue does this pull request address?**: Fixes #
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-**Notes for reviewers to consider**:
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