[dashboard] SEO: Improve SPA for search engines

[gtsiolis]

Problem to solve

The first iteration of the new dashboard, added as an SPA (Single-Page Application) in #3295, is currently showing up in some search engine results like the following when searching using the keywords gitpod app:

Google.com [1]	DuckDuckGo.com [2]

Proposal

TBD (To be discussed)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.