Update issue templates

.github/ISSUE_TEMPLATE/report-a-bug.md

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+---
+name: Report a bug
+about: Here you can report bugs and unexpected behavior
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+🤔 Did you rather want to [Ask a question](https://github.com/jbengler/tidyplots/discussions/categories/ask-a-question), [Propose a feature](https://github.com/jbengler/tidyplots/discussions/categories/propose-a-feature), or [Showcase a tidyplot](https://github.com/jbengler/tidyplots/discussions/categories/showcase-a-tidyplot)?
+If not, go ahead!
+
+## Description
+Provide a concise description of the unexpected behavior.
+
+## Reprex
+Provide the data and code to reproduce the bug.
+
+```
+# Here goes the code
+
+```