README.md: Use tarballs for Buildroot and EasyRSA

README.md: Add instructions for installing via dd

README.md: 'output_rootfs' -> 'output_build'

README.md: 'Installing via rauc' -> 'Updating via rauc'

README.md: Add 'Installing via rauc' section

README.md: 'BUILDING' -> 'Building'

README.md: Remove initramfs

README.md: Remove make toolchain

README.md: Make bundle name identical

README.md: 'Building is a process' -> 'Building is an easy process'

README.md: 'Set up' -> 'Then set up'

README.md: Don't add full stop after link

README.md: Fix buildroot manual link

README.md: Add instruction for required dependencies

README.md: Add fix for ca.crt not being readable online

README.md: jookia.org -> www.jookia.org

README.md: Fix easy-rsa signature command

README.md: Use make instead of brmake ...

brmake looks nice, but it just hangs asking for a password.

README.md: Use /var/www/www.jookia.org as web directory ...

This isn't how I usually do things, but it makes more sense for the
README.

README.md: Actually fix certs.sh path now

README.md: 'utilities/certs.sh' > 'scripts/certs.sh'

README.md: Update to use certs.sh

README: "Buildroot repoistory" -> "external Buildroot repository"

README: Add instructions for building