[Docs] Detailed roadmap and vision (#1991)

* [Docs] Update roadmap and vision

* Add shield to roadmap

* Update roadmap.md

* Link to .io in main README

* Fix verify links?

docs/overview/vision.md

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+---
+id: vision
+title: Vision
+---
+
+Our goal is to provide engineers with the best developer experience in the
+world.
+
+A fantastic developer experience leads to happy, creative and productive
+engineers. Our belief is that engineers should not have to be experts in various
+infrastructure tools to be productive. Infrastructure should be abstracted away
+so that you can return to building and scaling, quickly and safely.
+
+![](https://backstage.io/animations/backstage-logos-hero-8.gif)
+
+We are working on making Backstage the trusted standard toolbox (read: UX layer)
+for the open source infrastructure landscape. Think of it like Kubernetes for
+developer experience. We realize this is an ambitious goal. We can’t do it
+alone. If this sounds interesting or you'd like to help us shape our product
+vision, we'd love to talk. You can email me directly:
+[alund@spotify.com](mailto:alund@spotify.com).