remove the issue template

.github/ISSUE_TEMPLATE/contribution.yml

@@ -1,34 +0,0 @@
-name: Contribution Proposal
-description: Propose a change or feature (required for new contributors before submitting a PR)
-labels: []
-body:
-  - type: markdown
-    attributes:
-      value: |
-        **Before you start:** Read [CONTRIBUTING.md](https://github.com/ghostty-org/ghostty/blob/main/CONTRIBUTING.md).
-
-        Keep this short. If it doesn't fit on one screen, it's too long. Write in your own voice. Do not use AI.
-
-  - type: textarea
-    id: what
-    attributes:
-      label: What do you want to change?
-      description: Be specific and concise.
-    validations:
-      required: true
-
-  - type: textarea
-    id: why
-    attributes:
-      label: Why?
-      description: What problem does this solve?
-    validations:
-      required: true
-
-  - type: textarea
-    id: how
-    attributes:
-      label: How? (optional)
-      description: Brief technical approach if you have one in mind.
-    validations:
-      required: false