Redirect the Feature Requests issue template tab (#1788)

ref: #1705

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Feature Request
+    url: https://github.com/tiann/KernelSU/issues/1705
+    about: "We do not accept external Feature Requests, see this link for more details."

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,39 +0,0 @@
-name: Feature Request
-description: "Suggest an idea for this project"
-title: "[Feature]"
-labels: "feature"
-body:
-  - type: markdown
-    id: feature-info
-    attributes:
-      value: "## Feature Infomation"
-  - type: textarea
-    id: feature-main
-    validations:
-      required: true
-    attributes:
-      label: "Is your feature request related to a problem? Please describe."
-      description: "A clear and concise description of what the problem is."
-      placeholder: "I'm always frustrated when [...]"
-  - type: textarea
-    id: feature-solution
-    validations:
-      required: true
-    attributes:
-      label: "Describe the solution you'd like."
-      description: "A clear and concise description of what you want to happen."
-  - type: textarea
-    id: feature-describe
-    validations:
-      required: true
-    attributes:
-      label: "Describe alternatives you've considered."
-      description: "A clear and concise description of any alternative solutions or features you've considered."
-  - type: textarea
-    id: feature-extra
-    validations:
-      required: false
-    attributes:
-      label: "Additional context"
-      description: "Add any other context or screenshots about the feature request here."
-