github: Add issue templates and action

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 'Bug report'
+labels: ''
+assignees: ''
+about: Create a report to help us improve
+---

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Proposal
+about: Suggest an idea for Hugo
+title: ''
+labels: ''
+assignees: ''
+
+---

.github/ISSUE_TEMPLATE/support.md

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+---
+name: Support (Do not use)
+about: Please do not use Github for support requests. Visit https://discourse.gohugo.io for support
+title: ''
+labels: support
+assignees: ''
+
+---
+
+Issues created with this template will be automatically closed. Please visit https://discourse.gohugo.io for the support you really, really, want!

.github/workflows/auto_close_support.yml

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+on:
+  schedule:
+  - cron: 0 5 * * 3 
+name: Weekly Issue Closure
+jobs:
+  cycle-weekly-close:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: weekly-issue-closure
+      uses: bdougie/close-issues-based-on-label@master
+      env:
+        LABEL: support
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}