Migrate content syntax via script

The changes in this commit were auto-generated by running

tool/migrate.sh

Following this commit, the Dactyl build no longer works but the Redocly
build (mostly) should.

content/tutorials/python/modular-tutorials-in-python/nfts-using-python/index.md

@@ -2,9 +2,13 @@
 html: nfts-using-python.html
 parent: modular-tutorials-in-python.html
 top_nav_grouping: Article Types
-template: pagetype-category.html.jinja
+metadata:
+  indexPage: true
 blurb: Mint and sell NFTs on the XRP Ledger using Python.
 ---
 # NFTs Using Python
 
-Mint and sell NFTs on the XRP Ledger using Python.
+Mint and sell NFTs on the XRP Ledger using Python.
+
+
+{% child-pages /%}