Configure issue templates

Author: klmr

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: ⚠ Bug Report
+description: File a bug report
+labels: ["⚠️ bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+        Please also have a look at [existing open bug reports][bugs] to avoid duplicates.
+
+        [bugs]: https://github.com/klmr/box/labels/%E2%9A%A0%EF%B8%8F%20bug
+  - type: textarea
+    id: description
+    attributes:
+      label: Error description
+      placeholder: >
+        A brief description of the steps necessary to reproduce the issue, as
+        well as the expected and actual output.
+    validations:
+      required: true
+  - type: textarea
+    id: r-version
+    attributes:
+      label: R version
+      description: The output of running `R.version` in R
+      render: plain text
+    validations:
+      required: true
+  - type: input
+    id: box-version
+    attributes:
+      label: ‘box’ version
+      description: The output of running `packageVersion('box')` in R
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ❔ Frequently asked questions
+    url: https://klmr.me/box/articles/faq.html
+    about: The ‘box’ website contains a list of frequently asked questions
+  - name: 💬 ‘box’ questions on Stack Overflow
+    url: https://stackoverflow.com/questions/tagged/r-box?sort=Newest
+    about: When asking questions about ‘box’ on Stack Overflow, please use the [r-box] tag
+  - name: 💬 General questions and discussions
+    url: https://github.com/klmr/box/discussions/categories/q-a
+    about: You can also use the GitHub Discussions board for questions and answers

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: ✨ Feature request
+description: Request a new feature
+labels: ["✨ new feature"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before requesting a new feature, please first have a look at [existing feature requests][] to avoid duplicate requests.
+
+        [existing feature requests]: https://github.com/klmr/box/labels/%E2%9C%A8%20new%20feature
+  - type: textarea
+    id: description
+    attributes:
+      label: Please describe your feature request
+    validations:
+      required: true