docs: add mkdocs config and CI for building infra-docs website

Heavily inspired by: https://forgejo.c3voc.de/voc/av-docs

.forgejo/workflows/cleanup-docs.yaml

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+on:
+  pull_request:
+    types:
+      - closed
+
+jobs:
+  cleanup-staging:
+    runs-on: docker
+    container:
+      image: code.forgejo.org/oci/node:22-bookworm
+    steps:
+      - name: Pipeline info PR
+        run: |
+          echo "Run triggered by ${{ github.event_name }} (${{ github.event.action }}) on ref ${{ github.ref_name }}"
+
+      - name: Staging Deployment - Prepare keys
+        run: |
+          echo "${{ secrets.SSH_DEPLOY_KEY }}" > deploykey.priv
+          chmod 400 deploykey.priv
+          echo "${{ vars.SSH_KNOWN_HOSTS }}" > ./known_hosts
+
+      - name: Staging Deployment - Remove PR from staging
+        run: |
+          ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts' infra-docs-deploy@public-web-static.hosts.hamburg.ccc.de -t "rm -r /var/www/staging.infra-docs.hamburg.ccc.de/pr${{ github.event.pull_request.number }}/"

.forgejo/workflows/deploy-docs.yaml

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+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+env:
+  TZ: Europe/Berlin
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: docker.io/library/python:3.14-trixie
+    steps:
+      - name: Pipeline info
+        run: |
+          echo "Run triggered by ${{ github.event_name }} (${{ github.event.action }}) on ref ${{ github.ref_name }}"
+
+      - name: Install packages
+        run: |
+          apt update
+          apt -y install nodejs git rsync openssh-client
+          pip install --upgrade pip
+
+      - uses: actions/checkout@v6
+
+      - name: Install Python packages
+        run: |
+          pip install -r docs_requirements.txt
+
+      - name: Build website - prod
+        if: github.event_name != 'pull_request'
+        run: |
+          mkdocs build
+
+      - name: Build website - staging
+        if: github.event_name == 'pull_request'
+        run: |
+          sed -i "s#site_url: https://infra-docs.hamburg.ccc.de#site_url: https://staging.infra-docs.hamburg.ccc.de/pr${{ github.event.pull_request.number }}/#" mkdocs.yml
+          mkdocs build
+
+      - name: Deploy - Prepare keys
+        run: |
+          echo "${{ secrets.SSH_DEPLOY_KEY }}" > deploykey.priv
+          chmod 400 deploykey.priv
+          echo "${{ vars.SSH_KNOWN_HOSTS }}" > ./known_hosts
+
+      - name: Deploy - Upload PR to staging
+        if: github.event_name == 'pull_request'
+        run: |
+          echo "Deploying to staging.infra-docs.hamburg.ccc.de/pr${{ github.event.pull_request.number }}"
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" site/ infra-docs-deploy@public-web-static.hosts.hamburg.ccc.de:/var/www/staging.infra-docs.hamburg.ccc.de/pr${{ github.event.pull_request.number }}/
+
+      - name: Deploy - Add comment to PR with staging URL
+        if: github.event_name == 'pull_request' && github.event.action == 'opened'
+        run: |
+          curl \
+            -X POST \
+            ${{ github.event.pull_request.base.repo.url }}/issues/${{ github.event.pull_request.number }}/comments \
+            -H "Content-Type: application/json" \
+            -H "Authorization: token $FORGEJO_TOKEN" \
+            --data '{ "body": "You can view your changes at https://staging.infra-docs.hamburg.ccc.de/pr${{ github.event.pull_request.number }}/" }'
+
+      - name: Deploy - Upload to prod
+        if: github.event_name != 'pull_request'
+        run: |
+          rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" site/ infra-docs-deploy@public-web-static.hosts.hamburg.ccc.de:/var/www/infra-docs.hamburg.ccc.de/
+
+      - uses: actions/upload-artifact@v3
+        if: github.event_name == 'pull_request'
+        with:
+          name: docs-build
+          path: site/
+          retention-days: 3

docs_requirements.txt

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+mkdocs
+mkdocs-shadcn

mkdocs.yml

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+site_name: CCCHH Infrastructure Documentation
+site_url: https://infra-docs.hamburg.ccc.de
+repo_url: https://git.hamburg.ccc.de/CCCHH/ansible-infra
+copyright: MIT
+markdown_extensions:
+  - smarty
+  - admonition
+  - attr_list
+
+theme:
+  name: shadcn
+  show_title: true
+  show_stargazers: false
+  pygments_style:
+    light: shadcn-light
+    dark: github-dark
+  icon: oui:documentation
+  topbar_sections: false
+  show_datetime: false