Add placeholder for All That Lives

docs/metrics/events/all-that-lives/_data.yml

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+key_metrics:
+  total_audience:
+    title: Total audience engaged with this Signature event
+    ref: events.headlines.total_audience
+    description: Total audience engaged as part of My LEEDS 2023
+    colour: --l23-magenta

docs/metrics/events/all-that-lives/index.njk

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+---
+title: All That Lives
+summary: Metrics related to All That Lives - a Signature Event held by LEEDS 2023.
+tags:
+  - main
+order: 100
+work_in_progress: true
+metas:
+  title: Nest
+  description: |
+    Visualisations of key metrics related to All That Lives - a Signature Event held by LEEDS 2023.
+limitations:
+  - Events and activities data are extracted from Airtable.
+---
+
+{% from 'macros.njk' import dateFormatter %}
+
+<h2>Introduction</h2>
+
+<p>
+  All That Lives was a series of artworks, workshops and performances celebrating all those that we have loved and lost. A collaboration between The Grief Series and Zion Art Studio in Mexico, the work has been inspired by Mexican Day of the Dead and the ways other cultures celebrate and remember those they have lost. 
+</p>