Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Plausible Analytics
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+### Precheck
+
+Please note that this tracker is only for bugs. Do not use the issue tracker for help or support. [Our docs](https://docs.plausible.io/) are a great place for most answers, but if you can’t find your answer there, you can [contact us](https://plausible.io/contact). Thanks!
+
+## Prerequisites 
+- [ ] I have searched open and closed issues to make sure that the bug has not yet been reported.
+
+##Bug report
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots (If applicable)**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (If applicable):**
+ - OS: [e.g. macos]
+ - Browser [e.g. safari, firefox]
+ - Version [e.g. 78]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Plausible Analytics
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+## Precheck
+
+Please note that this tracker is only for feature requests. Do not use the issue tracker for help or support. [Our docs](https://docs.plausible.io/) are a great place for most answers, but if you can’t find your answer there, you can [contact us](https://plausible.io/contact). Thanks!
+
+## Prerequisites
+- [ ] I have searched open and closed issues to make sure that the feature has not yet been requested.
+
+##Feature request
+**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 [...]
+
+**How would you like it to work**
+A clear and concise description of what you want to happen.
+
+**Screenshots (If applicable)**
+If applicable, add screenshots to help explain the proposed solution.