Fixes #56
Closes #58

This simplifies setup by remove the unneeded RAM voltage checking.

According to the spec, DDR3L RAM has to work using 1.5V, see
https://en.wikipedia.org/wiki/DDR3_SDRAM#DDR3L_and_DDR3U_extensions.
Coreboot simply doesn't always implement changing voltage, which
can never prevent RAM from working though.

Closes #50
Fixes #38

First-time installation link was missing a dash

Closes #47

We already have a config for a more free version using SeaVGABIOS. From now
on we build, test and release that too. The image filename should just
contail _free_ which is probably enough.

Closes #32

We have to do this for the release, see #34

seabios has tagged a release and it's up at coreboot for review in be
included. We'll definitely have it in our next release.

shamelessly taken from https://github.com/Thrilleratplay/coreboot-builder-scripts

thanks a lot!

Closes #24

This should de-duplicate and simplify our docs.

Fixes #27

Now our scripts start with _where_ it should be run. x230_*.sh should
be run on the x230 where Skulls should be installed. external_*.sh
obviously not.

This also adds the -f <flasher> option and an interactive menu if not
specified.

Also, this updates our script commands in the documentation and moves the
"flashrom chip config" section under the "background" section.

Closes #26