chore: add back issue/pr template pointing to nuxt/nuxt

.github/FUNDING.yml

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+# These are supported funding model platforms
+
+# github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: [nuxt]
+open_collective: nuxtjs

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 👉 Repository Moved!
+    url: https://github.com/nuxt/nuxt
+    about: You can use the new combined repository to open an issue or discussion.

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+
+This repository has moved to https://github.com/nuxt/nuxt - pull requests very welcome there! 😊
+
+-->