github: tidy up issue templates

Switch to a model where all issues are by default marked with the Triage
label. This label allows us to mark an issue that requires attention
from a project maintainer. After an initial look, this label might well
be removed. But it might just as easily be re-added later in case
further attention/discussion is required amongst project maintainers.

At the same time, remove the "blank issue" option, and offer that
explicitly as an option within the template list (this allows us to
template the Triage label even for blank issues).

Signed-off-by: Paul Jolly <[email protected]>
Change-Id: I96d2896a7aa4dc82046b5bd5a5bfc411628964cf
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/520729

Author: myitcv

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: NeedsInvestigation
+labels: NeedsInvestigation, Triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1 @@
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea for this project
 title: ''
-labels: FeatureRequest
+labels: FeatureRequest, Triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/z.md

@@ -0,0 +1,7 @@
+---
+name: Blank issue
+title: ''
+labels: Triage
+assignees: ''
+
+---