Update and rename blank.yml to dev-issue.yml

.github/ISSUE_TEMPLATE/dev-issue.yml

@@ -0,0 +1,15 @@
+name: Vesktop Developer Issue
+description: Reserved for Vesktop Developers. Join our support server for support.
+
+body:
+    - type: markdown
+      attributes:
+          value: |
+              ![Are you a developer? No? This form is not for you!](https://github.com/Vencord/Vesktop/blob/main/.github/ISSUE_TEMPLATE/developer-banner.png?raw=true)
+              GitHub Issues are for developers, not support. Please use our [support server](https://vencord.dev/discord) if you are not a developer.
+    - type: textarea
+      id: content
+      attributes:
+          label: Content
+      validations:
+          required: true