docs(elsa): section index

elsa/README.md

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+# Elsa
+
+[Elsa](https://elsa-workflows.github.io/elsa-core/) is the workflow engine behind
+the **Elsa Flows** page in the app. This section is the first module of the
+documentation portal; the portal itself is generic and can host any number of
+sections.
+
+<div class="docs-note">
+This paragraph is raw HTML inside the markdown file — the portal renders extended
+markdown, so HTML blocks and custom elements are preserved.
+</div>
+
+<w4c-callout type="info">
+Custom elements authored in the docs repository are preserved by the renderer too.
+</w4c-callout>
+
+## In this section
+
+- **Getting started** — install nothing: open **Elsa Flows** and create your first definition.
+- **Workflows** — definitions, versions and publishing.
+- **Runs &amp; instances** — dispatch a workflow and inspect its execution.