Update using_apps.md

docs/ensembl-help/getting-started/using_apps.md

 ---
+slug: using_apps
 title: Using the Ensembl apps
 description: Here is how to use the apps in Ensembl
+related_articles:
+  - href: ../using-ensembl/viewing-ensembl-data/entity_viewer/entity-viewer.md
+  - href: ../using-ensembl/viewing-ensembl-data/genome-browser/browser.md
+tags:
+  - gene
+status: draft
 ---
 
 This is a placeholder for the _apps_ article.