### Bug description

I have a blog that has the following directory structure:

```markdown
$ tree
.
├── 404.qmd
├── _quarto.qmd
├── blog
│  ├── index.qmd
│  ├── welcome-to-my-blog
│  │  └── index.qmd
│  └── writing-papers-with-markdown
│     └── index.qmd
└── index.qmd
```

When visiting the page for `welcome-to-my-blog`, there's current no way for a user to go back up just one level:

<img width="1512" alt="image" src="https://user-images.githubusercontent.com/1813121/226499488-9ad6688d-789d-40f4-a459-ed99861e5ac5.png">

It is possible for users to click on the `logo` icon to go to the home level though.

It would be nice if this could be made to be like this instead:

<img width="1512" alt="image" src="https://user-images.githubusercontent.com/1813121/226500063-93a2144b-41e9-4603-9fb7-56eb7a38f88d.png">

where `~` was clickable to get to the root level and `blog` was clickable to blog folder level. Ideally it would be customizable with what text we'd want to show there. You wouldn't need to add `/` like I have in the screenshot, users can probably customize that with css before and after selectors. Users can always hide this by setting `display: none`.

What are your thoughts?

I'm using `title: false` in the `navbar` but adding a link to the `logo` in the `_quarto.yml` for the screenshots above:

```
website:
  title: "kdheepak"
  favicon: ./_quarto/favicon.svg
  search:
    location: navbar
  site-url: https://kdheepak.com
  repo-url: https://github.com/kdheepak/kdheepak.github.io
  repo-actions: [edit, issue]
  open-graph: true
  twitter-card: true
  sidebar:
    alignment: left
    style: docked
  navbar:
    title: false
    logo: _quarto/favicon.svg
    collapse: false
    search: true
    pinned: false
    right:
      - icon: github
        href: https://github.com/kdheepak
        aria-label: GitHub
      - icon: rss
        href: index.xml
        aria-label: RSS
```
### Checklist

- [ ] Please include a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [ ] Please [format your issue](https://quarto.org/bug-reports.html#formatting-make-githubs-markdown-work-for-us) so it is easier for us to read the bug report.
- [ ] Please document the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [ ] Please document the operating system you're running. If on Linux, please provide the specific distribution.
- [ ] Please provide the output of `quarto check` so we know which version of quarto and its dependencies you're running.
dragonstyle
2023-03-21T01:44:16Z
kdheepak
enhancement good-first-issue
v1.4
open
Allow customization of title to include link to folder level above
https://github.com/quarto-dev/quarto-cli/issues/4901