Update issue templates (#30)

superset-frontend/temporary_superset_ui/superset-ui/.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - superset-ui version: [e.g. v0.5.0]
+ - Node version: `node -v`
+ - npm version: `npm -v`
+ 
+**Additional context**
+Add any other context about the problem here.

superset-frontend/temporary_superset_ui/superset-ui/.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

superset-frontend/temporary_superset_ui/superset-ui/.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask for help with something.
+
+---
+
+Your question. 
+- How do I xxx?