Migrate to GitHub issue forms

This commit transitions from HTML-based issue templates to GitHub issue
forms, enhancing user experience by preventing accidental submissions
with comment-like metadata. This change makes submitting issues more
intuitive and reduces the chances of user errors (such as #355).

Key change include:

- Use a friendlier tone in the templates.
- Detail examples and descriptions to guide users more effectively.
- Rename templates for improved clarity and easy navigation.
- Add "a note from the maintainer".
- Include a direct link for donations to support the project.

.github/ISSUE_TEMPLATE/config.yml

@@ -1 +1,7 @@
-blank_issues_enabled: true
+# This file must be named `config.yml`. GitHub does not recognize the file if it is named `config.yaml`.
+blank_issues_enabled: true
+contact_links:
+  - name: Donate
+    url: https://undergroundwires.dev/donate/
+    about: ❤️ Donate to support the free software you love to keep it alive.
+  # A separate link for reporting vulnerabilities is not included here because GitHub generates it automatically.