added news panel topic (#24451)

docs/sources/panels/visualizations/_index.md

++++
+title = "Visualizations"
+type = "docs"
+[menu.docs]
+identifier = "visualizations"
+weight = 4
++++
\ No newline at end of file

docs/sources/panels/visualizations/news-panel.md

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+title = "News panel"
+keywords = ["grafana", "news", "documentation", "panels", "news panel"]
+type = "docs"
+[menu.docs]
+name = "news-panel"
+parent = "visualizations"
+weight = 850
+draft = "true"
++++
+
+## News panel
+
+This panel displays an RSS feed. By default, it displays articles from the Grafana Labs blog.
+
+Enter the URL of an RSS in the URL field in the Display section. This panel type does not accept any other queries.