Documentation: fix code block and literal block highlighting ...

Use shell script highlighting where it is resonable, use console
highlighting for transcripts, and fix some of the few cases where the
syntax was broken, resulting in text not being rendered at all.

Signed-off-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: Numerous typoes/fixes in first few chapters of user manual. ...

Doc fixes such as:

 * font changes
 * spelling
 * punctuation
 * capitalization

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

doc: link back from variables to device parameters ...

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

doc: remove board type from barebox prompt examples ...

I kept however the one example that directly demos the bootup on an
Efika board.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

doc: add colon after NOTE and HINT ...

Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: Add new sphinxs docs ...

This is a rewrite of the Documentation in reStructuredText format using
Sphinx as build system, see http://sphinx-doc.org/.

The documentation is built into static html pages with 'make docs'.
The pages can be found under Documentation/html after building.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>