chore: update issue templates (#4768)

* chore: delete release issue template

* chore: use bug-report form template

* chore: clean up config.yml for templates

* chore: clean up doc issue template

* chore: clean up feature request template

.github/ISSUE_TEMPLATE/feature-request.md

@@ -1,13 +1,15 @@
 ---
 name: Feature request
-about: Suggest an idea
-title: ""
-labels: feature
+about: Suggest an idea to improve code-server
+title: "[Feat]: "
+labels: enhancement
 assignees: ""
 ---
 
-<!--
-Please search for existing issues before filing.
+## What is your suggestion?
 
-Please describe the feature as clearly as possible!
--->
+## Why do you want this feature?
+
+## Are there any workarounds to get this functionality today?
+
+## Are you interested in submitting a PR for this?