Graph link error when clicking home/index node, adding extra /, which messes up other functionalities.

[Brodypen]

Describe the bug

Using the graph box from any subdirectory that's not home, if a user clicks on the node that leads back to home, it will adds a extra / to the end of the top level domain.

After this happens, with this extra '/' any links in the explorer, and backlinks will crash.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://quartz.jzhao.xyz/features/backlinks
2. Click on Welcome to Quartz 4
3. Use any link in explorer or backlink
4. See error

Expected behavior
The graph should not add this '/' once you go back to your home page.

Screenshots and Source
If applicable, add screenshots to help explain your problem.

You can help speed up fixing the problem by either

1. providing a simple reproduction
   

2. linking to your Quartz repository where the problem can be observed
   https://quartz.jzhao.xyz/features/backlinks

Desktop (please complete the following information):

• Quartz Version: Current version of Quartz site.
• node v23.1.0
• npm 10.9.0
• OS: macOs
• Browser: Arc