Update issue templates

Bugs only, now we're using "discussions"

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,8 +1,8 @@
 ---
 name: Bug Report
 about: Create A Bug Report
-title: 'A concise title of what the bug is.'
-labels: 'bug'
+title: A concise title of what the bug is.
+labels: bug
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,20 +0,0 @@
----
-name: Enhancement or Feature Request
-about: Suggest an addition to libvips
-title: ''
-labels: 'enhancement'
-assignees: ''
-
----
-
-**Is your feature request related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
-
-**Describe the solution you'd like**
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you've considered**
-A clear and concise description of any alternative solutions or features you've considered.
-
-**Additional context**
-Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -1,11 +0,0 @@
----
-name: Question
-about: Ask a Question
-title: ''
-labels: 'question'
-assignees: ''
-
----
-
-Ask a question...
-