fix(frontend): restore the data tables description lost in the branch split

The rewritten description went into DataTableSettings.svelte shortly before that file was
restored wholesale to its pre-rebuild state, so it left with the row rework it had nothing
to do with. The tab went back to describing the plumbing -- a fully managed PostgreSQL
database, reachable from the SDK -- which never answered the question a new user actually
has: why this rather than a Postgres resource.

It leads with what a data table is, then the two things a resource cannot do -- nobody
needs the credentials to query it, and the name can be pointed at another database without
editing anything that uses it -- and closes with what Windmill runs on top. Both middle
claims are the ones every resolution path backs up: datatable:// resolves by workspace and
name, unchecked.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

frontend/src/lib/components/workspaceSettings/DataTableSettings.svelte

@@ -254,7 +254,7 @@
 
 <SettingsPageHeader
 	title="Data tables"
-	description="Store relational data out of the box. Interact with a fully managed PostgreSQL database directly from the Windmill SDK."
+	description="Relational storage the whole workspace shares under one name. Scripts, flows and apps address it as <span class='font-mono'>datatable://main</span> instead of picking a PostgreSQL resource, so nobody needs access to the credentials to query it, and you can point that name at another database without touching a line of code. Browse and edit tables, and version schema changes as migrations, from here."
 	link="https://www.windmill.dev/docs/core_concepts/persistent_storage/data_tables"
 />