Add missing files

.pa11yci.json

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+{
+  "defaults": {
+    "standard": "WCAG2AA",
+    "runners": ["axe", "htmlcs"],
+    "timeout": 60000,
+    "chromeLaunchConfig": {
+      "args": ["--no-sandbox", "--disable-dev-shm-usage"]
+    }
+  }
+}

layouts/_markup/render-image.html

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+{{- /*
+Content images. The Markdown title ("![alt](src "© Credit")") is the photo credit; it is shown
+as a caption instead of a tooltip, so that it is available on touch devices and to screen readers.
+An image on its own line becomes a figure; images sharing a paragraph get an inline credit.
+*/ -}}
+{{- $src := .Destination -}}
+{{- $width := 0 -}}
+{{- $height := 0 -}}
+{{- with or (.PageInner.Resources.Get (strings.TrimPrefix "./" .Destination)) (resources.Get .Destination) -}}
+  {{- $src = .RelPermalink -}}
+  {{- if and (eq .ResourceType "image") (ne .MediaType.SubType "svg") -}}
+    {{- $width = .Width -}}
+    {{- $height = .Height -}}
+  {{- end -}}
+{{- end -}}
+{{- /* A title that only repeats the alt text is not a credit. */ -}}
+{{- $credit := cond (eq .Title .PlainText) "" .Title -}}
+{{- $img := printf `<img src="%s" alt="%s"%s>` (htmlEscape $src) (htmlEscape .PlainText) (cond (gt $width 0) (printf ` width="%d" height="%d"` $width $height) "") -}}
+{{- if .IsBlock -}}
+<figure class="content-image">
+{{ $img | safeHTML }}
+{{- with $credit }}
+<figcaption class="content-image__credit">{{ . }}</figcaption>
+{{- end }}
+</figure>
+{{- else if $credit -}}
+<span class="content-image">{{ $img | safeHTML }}<span class="content-image__credit">{{ $credit }}</span></span>
+{{- else -}}
+{{ $img | safeHTML }}
+{{- end -}}

scripts/pa11y.sh

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+#!/bin/sh
+# Accessibility check with pa11y-ci, used by CI and for local runs (see README.md).
+# Builds the site into a temporary directory, serves it on localhost and checks every page
+# in the sitemaps except the past events, which are kept as they were.
+set -eu
+
+PA11Y_CI_VERSION=5.0.0
+PORT=${PORT:-8080}
+# Pages that are not checked: past events and the individual news posts.
+EXCLUDE='^http://localhost:[0-9]+/[a-z]+/(37c3|38c3|39c3|eh22|posts/[^/]+)/'
+
+# Use an installed Chrome/Chromium instead of letting Puppeteer download one.
+if [ -z "${PUPPETEER_EXECUTABLE_PATH:-}" ]; then
+  for candidate in /usr/bin/chromium-browser /usr/bin/chromium "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"; do
+    if [ -x "$candidate" ]; then PUPPETEER_EXECUTABLE_PATH=$candidate; break; fi
+  done
+fi
+export PUPPETEER_EXECUTABLE_PATH
+export PUPPETEER_SKIP_DOWNLOAD=1
+
+cd "$(dirname "$0")/.."
+site=$(mktemp -d)
+hugo --quiet --buildFuture --buildDrafts --baseURL "http://localhost:$PORT/" -d "$site"
+python3 -m http.server "$PORT" --bind 127.0.0.1 -d "$site" >/dev/null 2>&1 &
+server=$!
+trap 'kill $server; rm -rf "$site"' EXIT
+sleep 1
+
+status=0
+for lang in de en; do
+  npx --yes "pa11y-ci@$PA11Y_CI_VERSION" --config .pa11yci.json \
+    --sitemap "http://localhost:$PORT/$lang/sitemap.xml" --sitemap-exclude "$EXCLUDE" || status=1
+done
+exit $status