chore: update issue templates (#2041)

Signed-off-by: Gaius <gaius.qi@gmail.com>

.github/ISSUE_TEMPLATE/bug-report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug Report
 about: Report a bug for dragonfly
-labels: kind/bug
+labels: bug
 
 ---
 
@@ -18,6 +18,7 @@ labels: kind/bug
 <!-- How can a maintainer reproduce this issue (please be detailed) -->
 
 ### Environment:
+
 - Dragonfly version:
 - OS:
 - Kernel (e.g. `uname -a`):

.github/ISSUE_TEMPLATE/custom.md

@@ -1,6 +1,5 @@
 ---
-name: Custom
+name: Custom issue template
 about: Custom issue template for dragonfly
-labels: kind/custom
 
 ---

.github/ISSUE_TEMPLATE/feature-request.md

@@ -1,7 +1,7 @@
 ---
 name: Feature Request
 about: Request a new feature for dragonfly
-labels: kind/feature
+labels: enhancement
 
 ---