Update docs for v0.3.0 (#1742)

## Issue Addressed

NA

## Proposed Changes

- Remove Metamask deposits from the docs.
    - Restructure docs to be launchpad-centric.
- Remove references to sigp/lighthouse-docker.
- Add section about binaries.


## Additional Info

Please provide any additional information. For example, future considerations
or information useful for reviewers.

book/src/installation-source.md

@@ -0,0 +1,82 @@
+# Installation: Build from Source
+
+Lighthouse builds on Linux, macOS, and Windows (via [WSL][] only).
+
+Compilation should be easy. In fact, if you already have Rust installed all you
+need is:
+
+- `git clone https://github.com/sigp/lighthouse.git`
+- `cd lighthouse`
+- `make`
+
+If this doesn't work or is not clear enough, see the [Detailed
+Instructions](#detailed-instructions) below. If you have further issues, see
+[Troubleshooting](#troubleshooting). If you'd prefer to use Docker, see the
+[Docker Guide](./docker.md).
+
+## Detailed Instructions
+
+1. Install Rust and Cargo with [rustup](https://rustup.rs/).
+    - Use the `stable` toolchain (it's the default).
+	- Check the [Troubleshooting](#troubleshooting) section for additional
+		dependencies (e.g., `cmake`).
+1. Clone the Lighthouse repository.
+    - Run `$ git clone https://github.com/sigp/lighthouse.git`
+    - Change into the newly created directory with `$ cd lighthouse`
+1. Build Lighthouse with `$ make`.
+1. Installation was successful if `$ lighthouse --help` displays the
+   command-line documentation.
+
+> First time compilation may take several minutes. If you experience any
+> failures, please reach out on [discord](https://discord.gg/cyAszAh) or
+> [create an issue](https://github.com/sigp/lighthouse/issues/new).
+
+## Windows Support
+
+Compiling or running Lighthouse natively on Windows is not currently supported. However,
+Lighthouse can run successfully under the [Windows Subsystem for Linux (WSL)][WSL]. If using
+Ubuntu under WSL, you can should install the Ubuntu dependencies listed in the [Dependencies
+(Ubuntu)](#dependencies-ubuntu) section.
+
+[WSL]: https://docs.microsoft.com/en-us/windows/wsl/about
+
+## Troubleshooting
+
+### Dependencies
+
+#### Ubuntu
+
+Several dependencies may be required to compile Lighthouse. The following
+packages may be required in addition a base Ubuntu Server installation:
+
+```bash
+sudo apt install -y git gcc g++ make cmake pkg-config libssl-dev
+```
+
+#### macOS
+
+You will need `cmake`. You can install via homebrew:
+
+    brew install openssl cmake
+
+### Command is not found
+
+Lighthouse will be installed to `CARGO_HOME` or `$HOME/.cargo`. This directory
+needs to be on your `PATH` before you can run `$ lighthouse`.
+
+See ["Configuring the `PATH` environment variable"
+(rust-lang.org)](https://www.rust-lang.org/tools/install) for more information.
+
+### Compilation error
+
+Make sure you are running the latest version of Rust. If you have installed Rust using rustup, simply type `$ rustup update`.
+
+### OpenSSL
+
+If you get a build failure relating to OpenSSL, try installing `openssl-dev` or
+`libssl-dev` using your OS package manager.
+
+- Ubuntu: `$ apt-get install libssl-dev`.
+- Amazon Linux: `$ yum install openssl-devel`.
+
+[WSL]: https://docs.microsoft.com/en-us/windows/wsl/about