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

This fixes some listings and links

As of commit

   e397f55702 3rdparty/blobs: Update submodule marker for Intel microcode updates

this is all included. yay.

this addresses #22 but we could actually build a patched ISO...