Only create content records

and avoid intermediate level records, so that output is something like:

```
{
"content": "Heading 1 Summary Lorem ipsum dolor sit amet",
"hierarchy": {
"lvl0": "Chapter 1",
"lvl1": "Heading 1",
"lvl2": null,
}

{
"content": "Heading 2 Summary Lorem ipsum dolor sit amet",
"hierarchy": {
"lvl0": "Chapter 1",
"lvl1": "Heading 2",
"lvl2": null,
}

{
"content": "Heading 3 Summary Lorem ipsum dolor sit amet",
"hierarchy": {
"lvl0": "Chapter 1",
"lvl1": "Heading 3",
"lvl2": null,
}
```

Start by locating the Markdown-to-Algolia record generation described by the repository; compare its current records with the example in this issue. Done means output contains only content records with the requested hierarchy and no intermediate-level records.

Written by the indexing model from the issue text.