Introduce 3 issue templates and links (#1097)

* Introduce 3 issue templates and links
- template for bug, question, feature request
- configure community links for slack/kpt website

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: 🐞 Bug Report
+about: Report an issue with kpt
+title: ""
+labels:
+  - bug
+assignees: ""
+---
+
+### Expected behavior
+
+### Actual behavior
+
+### Information
+
+<!-- Please include any additional information related to your issue -->
+<!-- EX: -->
+<!--     Kpt Version (you may find this by running `kpt version` in your shell) -->
+<!--     Kpt Package that can demonstrate the error. Ex: https://github.com/kubernetes/examples/staging/cockroachdb -->
+
+### Steps to reproduce the behavior

.github/ISSUE_TEMPLATE/config.yaml

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+blank_issues_enabled: true
+contact_links:
+  - name: Kpt Slack Channel
+    url: https://kubernetes.slack.com/app_redirect?channel=kpt
+    about: Discuss Kpt Topics with the Kpt Team on Slack
+  - name: Kpt Guides
+    url: https://googlecontainertools.github.io/kpt/guides/
+    about: Learn more about using kpt with these guides
+  - name: Kpt Mailing List
+    url: https://groups.google.com/forum/#!forum/kpt-users
+    about: Join the Kpt mailing list

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: 💡 Feature Request
+about: Suggest an idea for kpt
+title: ""
+labels:
+  - enhancement
+assignees: ""
+---
+
+### Is your feature request related to a problem? Please describe.
+
+### Describe the solution you'd like
+
+### Describe alternatives you've considered
+
+### Additional context

.github/ISSUE_TEMPLATE/question.md

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+---
+name: ❓ Question
+about: Ask a question about kpt
+title: "[Question]"
+labels:
+  - question
+assignees: ""
+---
+
+<!-- Describe your question here -->