Update issue template (#5182)

* Write new issue template

* Delete old template

Author: teunbrand

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Submit a bug report to help us improve ggplot2
+---
+
+### Tips for a helpful bug report:
+
+* If you have a question, please don't use this form. Instead, ask on <https://stackoverflow.com/> or <https://community.rstudio.com/>.
+
+* Please include a **minimal reproducible example**, a reprex, to demonstrate the bug.
+If you've never heard of a reprex, please read ["Make a reprex"](https://www.tidyverse.org/help/#reprex).
+Do not include session info unless it is explicitly asked for.
+
+* If you can, use one of the built-in datasets or a small toy dataset that exposes the bug.
+If for some reason, the bug only occurs on your original data, try to limit the number of rows that are necessary to expose the bug. 
+Share such data by copying `dput()` output rather than an external file.
+
+* Unless the bug is about the theme, labels, scales or other plot decoration: please omit these from the code.
+    
+* Please check whether somebody has reported the same problem in the [issues](https://github.com/tidyverse/ggplot2/issues).
+
+Delete these instructions once you have read them.
+
+---
+
+I found a problem with ...
+
+I expected ...
+
+Here is the code to reproduce the bug:
+
+```r
+# copy your code to the clipboard and run:
+reprex::reprex()
+```

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Help or discussion
+    url: https://community.rstudio.com/
+    about: "Check out options for getting help on the RStudio Community."

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "Feature Request"
+about: Suggest a change or new feature in ggplot2
+---
+
+### Tips for a helpful feature request:
+
+* If you have a question, please don't use this form. Instead, ask on <https://stackoverflow.com/> or <https://community.rstudio.com/>.
+
+* See the [contributing guidelines](https://github.com/tidyverse/ggplot2/blob/main/CONTRIBUTING.md).
+
+* ggplot2 is a mature package that is unlikely to adopt new functionality that can be covered by its extension mechanisms.
+Improvements to its current functionality or to infrastructure are considered in scope for feature requests.
+
+* Please motivate the need for change, if applicable with a **minimal reproducible** example (reprex).
+If you've never heard of a reprex, please read ["Make a reprex"](https://www.tidyverse.org/help/#reprex).
+Do not include session info unless it is explicitly asked for.
+
+Delete this instructions once you've read them.
+
+---
+
+In situations when ...
+
+I would like to be able to ...
+
+```r
+# copy your code to the clipboard and run:
+reprex::reprex()
+```