Update issue templates with the new GitHub system

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+<!-- *Before creating an issue please make sure you are using the latest version of STF.* -->
+
+**What is the issue or idea you have?**
+
+**Does it only happen on a specific device? Please run `adb devices -l` and paste the corresponding row.**
+
+**Please provide the steps to reproduce the issue.**
+
+**What is the expected behavior?**
+
+**Do you see errors or warnings in the `stf local` output? If so, please paste them or the full log here.**
+
+**Please run `stf doctor` and paste the output here.**

.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.