Router adds duplicate entry to session history stack

[zqianem]

Describe the bug

When navigating to a VitePress site from any other domain (e.g. this link: https://vitepress.vuejs.org/), the VitePress router adds a duplicate entry to the browser session's history stack. This occurs because history.pushState() is called via router.go() on the initial page load.

The effect of this depends on the browser.

• In Chromium-based browsers, due to implementing History Manipulation Intervention, the back button works as expected and the user returns to the previous page (e.g. this page).

• Safari implements something similar and the back button also works as expected.

• In Firefox, the user has to click the back button twice to return.

In all cases, the duplicate entry is still visible in the history stack.

Reproduction

1. Visit https://vitepress.vuejs.org/ by left clicking the link.
2. Right click (if Safari, long press) on the browser's back button and notice there is an extra entry.

Expected behavior

The extra entry is not added, like when visiting https://developer.mozilla.org/en-US/.

System Info

System:
    OS: Linux 6.1 Arch Linux
    CPU: (16) x64 AMD Ryzen 7 5700G with Radeon Graphics
    Memory: 23.05 GB / 30.74 GB
    Container: Yes
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 16.19.0 - /usr/bin/node
    npm: 8.19.2 - /usr/bin/npm
  Browsers:
    Chromium: 109.0.5414.74
    Firefox: 108.0.2

Additional context

No response

Validations

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• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.