FEAT: add default issue template (fix)

see: https://docs.gitlab.com/ee/user/project/description_templates.html#set-a-default-template-for-merge-requests-and-issues

.gitlab/issue_templates/Default.md

-Feature Proposal.md
\ No newline at end of file

.gitlab/issue_templates/Default.md

+## Description
+
+<!-- Include problem, use cases, benefits, and/or goals -->
+
+## Proposal
+
+
+
+## Links to related issues and merge requests / references
+
+<!-- Please paste a link of the related issues or/and merge requests -->
+
+
+
+/label ~Feature

.gitlab/issue_templates/Feature Proposal.md

-## Description
-
-<!-- Include problem, use cases, benefits, and/or goals -->
-
-## Proposal
-
-
-
-## Links to related issues and merge requests / references
-
-<!-- Please paste a link of the related issues or/and merge requests -->
-
-
-
-/label ~Feature