✨ External links in docs with data file (#1701)

* ➕ Add mkdocs-markdownextradata-plugin for docs

* 🔧 Update MkDocs config file(s) to include external data

* ✨ Add external links data file

* 📝 Use external data file in External Links

* ♻️ Update data files for langs

The cost is some duplication 😔, these files are updated by the script, but to be able to serve locally they have to be duplicated

* ✨ Update docs script to copy data files

* 🔥 Remove needed duplication of data files for live docs in translations

docs/it/mkdocs.yml

@@ -17,6 +17,9 @@ edit_uri: ''
 google_analytics:
 - UA-133183413-1
 - auto
+plugins:
+- markdownextradata:
+    data: data
 nav:
 - FastAPI: index.md
 - Languages: