Merge pull request #46 from async-rs/book-release-ready

Book release ready

docs/src/introduction.md

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 # Introduction
 
+![async-std logo](./images/horizontal_color.svg)
+
 This book serves as high-level documentation for `async-std` and a way of learning async programming in Rust through it. As such, i focusses on the `async-std` and its task model give you.
 
 Please note that the Rust project provides its own book on asynchronous programming, called ["Asynchronous Programming in Rust"][async-book], which we highly recommend reading along with this book, as it provides a different, wider view on the topic.

docs/src/overview/async-std.md

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 # Welcome to `async-std`
 
-![async-std logo](./images/horizontal_color.svg)
-
 `async-std` along with its [supporting libraries][organization] is a library making your life in async programming easier. It provides provide fundamental implementations for downstream libraries and applications alike. The name reflects the approach of this library: it is a closely modeled to the Rust main standard library as possible, replacing all components by async counterparts.
 
 `async-std` provides an interface to all important primitives: filesystem operations, network operations and concurrency basics like timers. It also exposes an `task` in a model similar to the `thread` module found in the Rust standard lib.  But it does not only include io primitives, but also `async/await` compatible versions of primitives like `Mutex`. You can read more about `async-std` in [the overview chapter][overview-std].