Add a progressbar on top when performing navigation, like VuePress.

Is your feature request related to a problem? Please describe.

no

Describe the solution you'd like

check this page out: https://v2.vuepress.vuejs.org/

click some links as you wish, be notice that there is a progressbar on top when navigating.

If there're no indicators and a user has slow network, it feels like a link is clicked but nothing happen. Feels strange.

Describe alternatives you've considered

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the docs.
• Read the Contributing Guidelines.
• Check that there isn't already an issue that asks for the same feature to avoid creating a duplicate.