docs: remove feature request issue template

***NO_CI***

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,13 +0,0 @@
----
-name: Feature request
-about: Suggest an idea for this project
-title: ''
-labels: ''
-assignees: ''
-
----
-
-!! IMPORTANT !!
-Do not submit feature requests here. Use our feature request board instead:
-
-https://wiki.js.org/feedback