fix(explorer): display names for folders without frontmatter (#494)
* fix(explorer): display name for folders without `index` file * docs(explorer): add section for folder display names
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		@@ -8,6 +8,8 @@ Quartz features an explorer that allows you to navigate all files and folders on
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By default, it shows all folders and files on your page. To display the explorer in a different spot, you can edit the [[layout]].
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Display names for folders get determined by the `title` frontmatter field in `folder/index.md` (more detail in [[Authoring Content]]). If this file does not exist or does not contain frontmatter, the local folder name will be used instead.
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> [!info]
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> The explorer uses local storage by default to save the state of your explorer. This is done to ensure a smooth experience when navigating to different pages.
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>
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@@ -46,7 +46,10 @@ export class FileNode {
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      if (file.path[0] !== "index.md") {
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        this.children.push(new FileNode(file.file.frontmatter!.title, file.file, this.depth + 1))
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      } else {
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        this.displayName = file.file.frontmatter!.title
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        const title = file.file.frontmatter?.title
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        if (title && title !== "index" && file.path[0] === "index.md") {
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          this.displayName = title
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        }
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      }
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    } else {
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      const next = file.path[0]
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