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...

how did this end up there?

Closes #15

We locally add Intel's new microcode package, currently under review
upstream here:

https://review.coreboot.org/#/c/blobs/+/23315/

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>

Signed-off-by: Martin Kepplinger <martink@posteo.de>