When using storyMatch in histoire.config, Sibling markdown are not imported

### Describe the bug

When using storyMatch in histoire.config, Sibling markdown are not imported

### Reproduction

1. add directories to the histoire.config storyMatch like
` storyMatch: [
'**/*.story.vue',
'../../packages/src/**/*.story.vue'],`
2. have a story and a sibling markdown file
3. run story:dev
4. sibling markdowns will not be rendered.

### System Info

```shell
System:
OS: macOS 13.5.2
CPU: (10) arm64 Apple M1 Pro
Memory: 98.75 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.11.0 - ~/.nvm/versions/node/v20.11.0/bin/node
npm: 8.19.4 - ~/development/shop-frontends/node_modules/.bin/npm
Browsers:
Brave Browser: 112.1.50.121
Chrome: 121.0.6167.160
Firefox: 121.0
Safari: 16.6
npmPackages:
@histoire/plugin-nuxt: 0.17.10 => 0.17.10
@histoire/plugin-vue: 0.17.9 => 0.17.9
@vitejs/plugin-vue: 4.4.0 => 4.4.0
histoire: 0.17.9 => 0.17.9
vite: 4.4.9 => 4.4.9
```

### Used Package Manager

npm

### Validations

- [X] Follow our [Code of Conduct](https://github.com/histoire-dev/histoire/blob/main/CODE_OF_CONDUCT.md)
- [X] Read the [Contributing Guidelines](https://github.com/histoire-dev/histoire/blob/main/CONTRIBUTING.md).
- [X] Read the [docs](https://histoire.dev/guide/).
- [X] Check that there isn't [already an issue](https://github.com/histoire-dev/histoire/issues) that reports the same bug to avoid creating a duplicate.
- [X] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/histoire-dev/histoire/discussions).
- [X] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.

Start by reproducing the issue with the shown histoire.config storyMatch entries and story:dev command. Trace how matching stories discovers sibling Markdown files, then verify that those files are rendered alongside the stories when the fix is complete.

Written by the indexing model from the issue text.