Improve issue templates

Deleted feature request as that has to do with the website which is more
or less the same as an enhancement (now a website enhancement).

Improved/fixed labels.

.github/ISSUE_TEMPLATE/documentation.yml

@@ -1,6 +1,6 @@
 name: Documentation issue
 description: Report a problem with documentation
-title: "[Documentation] <title>"
+title: "Documentation: <issue synopsis>"
 labels: ["documentation"]
 body:
 - type: checkboxes