♻️ Content - .md to .mdx

[bradystroud]

We need to change all the rules content to MDX.
Read more about when to use MDX - https://www.ssw.com.au/rules/mdx-vs-markdown/

We need a script to migrate all the content (.NET Console app)

Unfortunately, the script cannot be written until we have built the components (e.g. greybox) See - #1629

This is how development should go

1. MDX component is migrated
2. Script - add a function that finds all the old ::: component and converts them to MDX
3. Updated script is tested and run on a branch of the rules content
4. The updated content and script is committed to the branch
5. This triggers a deploy to a staging environment

Eventually this branch will be merged into main, when you can search in vs code and there are no more :::

Tasks

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1. Create the script so devs can add to it
2. Document this process