Convert the "Blockly JSON Serialization Migration Guide" to Markdown

[rpbourret]

Location

https://docs.google.com/document/d/1wv5ORrO4icVHeU15FLSn37mdNLyJpQbMTo7mmTqsGl0/edit?tab=t.0

Type

• Text
• Image or Gif
• Other

Suggested content

The Blockly JSON Serialization Migration Guide is a Google document. It is presumably owned by Google and should be migrated to Markdown and integrated into the regular documentation.

Steps:

1. Convert doc to Markdown (/guides/configure/web/migrate-xml-to-json.md)
2. Add a Save and Load section to the TOC.
3. Move the current Save and Load topic to the first entry in this section.
4. Add the migration topic as the second entry in this section.

Additional context

No response

[maribethb]

Beka owns that doc, we definitely should migrate it to the rest of the docs, but there's no rush on it and it can wait until we finish the docusaurus stuff so that we have a good place to check it into.

Aaron says docs may have a save as markdown feature that would help with this