Akihito Nakano 6883e1bfb6 Fix broken links in book (#2912 )

## Issue Addressed

https://github.com/sigp/lighthouse/issues/2889

## Additional Info

I have checked that linkcheck has succeeded on the book built locally. 👌 

```shell
$ cd book
$ mdbook serve --open
...
2022-01-14 01:13:40 [INFO] (mdbook::book): Book building has started
2022-01-14 01:13:40 [INFO] (mdbook::book): Running the html backend

$ linkcheck http://localhost:3000
Perfect. Checked 4495 links, 80 destination URLs (76 ignored).
```

Also I'll tackle running linkcheck on CI in another pull request.

2022-01-14 00:38:04 +00:00

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Raspberry Pi 4 Installation

Tested on:

Raspberry Pi 4 Model B (4GB)
Ubuntu 20.04 LTS (GNU/Linux 5.4.0-1011-raspi aarch64)

Note: Lighthouse supports cross-compiling to target a Raspberry Pi (aarch64). Compiling on a faster machine (i.e., x86_64 desktop) may be convenient.

1. Install Ubuntu

Follow the Ubuntu Raspberry Pi installation instructions.

A 64-bit version is required and latest version is recommended (Ubuntu 20.04 LTS was the latest at the time of writing).

A graphical environment is not required in order to use Lighthouse. Only the terminal and an Internet connection are necessary.

2. Install Packages

Install the Ubuntu Dependencies. (I.e., run the sudo apt install ... command at that link).

Tips:

If there are difficulties, try updating the package manager with sudo apt update.

3. Install Rust

Install Rust as per rustup. (I.e., run the curl ... command).

Tips:

When prompted, enter 1 for the default installation.

Try running cargo version after Rust installation completes. If it cannot be found, run source $HOME/.cargo/env.

It's generally advised to append source $HOME/.cargo/env to ~/.bashrc.

4. Install Lighthouse

git clone https://github.com/sigp/lighthouse.git
cd lighthouse
git checkout stable
make

Compiling Lighthouse can take up to an hour. The safety guarantees provided by the Rust language unfortunately result in a lengthy compilation time on a low-spec CPU like a Raspberry Pi. For faster compilation on low-spec hardware, try cross-compiling on a more powerful computer (e.g., compile for RasPi from your desktop computer).

Once installation has finished, confirm Lighthouse is installed by viewing the usage instructions with lighthouse --help.

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