docs: remove redundant sections and broken link

Author: alan-agius4

README.md

@@ -7,7 +7,6 @@
 # Table of Contents
 * [Introduction](#introduction)
 * [Getting Started with Universal](#getting-started)
-* [Upgrading to Version 8](#version-8)
 * [Packages](#packages)
 * [Universal "Gotchas"](#universal-gotchas)
 * [Roadmap](#roadmap)
@@ -29,9 +28,6 @@ The Universal project is driven by community contributions. Please send us your
 
 [Angular Universal Guide](https://angular.io/guide/universal)
 
-# Version 8
-Follow this upgrade guide if you are upgrading an existing Universal project to Angular version 8 - [Guide](/docs/v8-upgrade-guide.md)
-
 # Packages
 The packages from this repo are published as scoped packages under [@nguniversal](https://www.npmjs.com/search?q=%40nguniversal)
 
@@ -61,9 +57,6 @@ Moved to [/docs/gotchas.md](/docs/gotchas.md)
 - Support [AppShell](https://developers.google.com/web/updates/2015/11/app-shell) use cases
 - Development server/watch mode builder with livereload for CLI
 
-## In Progress
-- Static site rendering
-
 ## Planning
 - Full client rehydration strategy that reuses DOM elements/CSS rendered on the server
 - Better internal performance and stress tests