Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Before submitting the issue**
+- Check whether a bug report is the right format for your issue. For questions about using the `mice` package, see [Discussions](https://github.com/amices/mice/discussions). For theoretical background about the `mice` methods, see [Flexible Imputation of Missing Data](https://stefvanbuuren.name/fimd/).
+- Please make sure that you are using the latest version of `mice` (e.g. with the `packageVersion()` or `sessionInfo()` function).
+- Please verify whether the bug has already been addressed (e.g. on [GitHub](https://github.com/amices/mice/issues?q=is%3Aissue) or [Stack Overflow](https://stackoverflow.com/questions/tagged/r-mice).
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Create a **repr**oducible **ex**ample, see e.g. the [`reprex` package](https://reprex.tidyverse.org/). A good reprex uses simulated or public data to showcase the bug. We recommend using one of the incomplete datasets included in the `mice` package (e.g. `mice::boys`) and the `reprex()` function from the `reprex` package.
+
+Paste the code and output of your reprex here.
+
+**Expected behavior**
+A clear and concise description of what you expect to happen without the bug.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**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.

.github/ISSUE_TEMPLATE/help_wanted.md

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+---
+name: '`mice` in practice'
+about: Get help with your `mice` code
+title: ''
+labels: 'help wanted'
+assignees: ''
+
+---
+
+![ALT: "these are not the droids you're looking for"](https://media.tenor.com/TlfAvuz0tLMAAAAC/obi-wan-kenobi-these-are-not-the-droids.gif)
+
+We're happy to help, but Issues are meant for bug reports and feature requests. Please post your question on the [Discussion forum](https://github.com/amices/mice/discussions).