docs: add issue check

.github/issuecomplete.yml

+# The name of the label to apply when an issue does not have all tasks checked
+labelName: invalid
+
+# The color of the label in hex format (without #)
+labelColor:
+
+# The text of the comment to add to the issue in addition to the label
+commentText: >
+  You haven't provided the required info about your host! (OS, Wiki.js version, Database engine)
+
+# Whether or not to ensure all checkboxes are checked
+checkCheckboxes: false
+
+# Keywords to look for in the body of the issue
+keywords:
+  - Wiki.js version
+  - Database engine