doc: Replace DocBook with sphinx-based docs

The Linux kernel moved to sphinx-based documentation and got rid of the
DocBook based documentation quite a while ago. Hence, the DocBook
documentation for U-Boot should be converted as well.

To achieve this, import the necessary files from Linux v4.17, and
convert the current DocBook documentation (three files altogether) to
sphinx/reStructuredText.

For now, all old DocBook documentation was merged into a single
handbook, tentatively named "U-Boot Hacker Manual".

For some source files, the documentation style was changed to comply
with kernel-doc; no functional changes were applied.

Signed-off-by: Mario Six <mario.six@gdsys.cc>

1 files changed, 0 insertions, 16 deletions

diff --git a/doc/DocBook/docbook.css b/doc/DocBook/docbook.css
deleted file mode 100644
index 7a79ec54bd..0000000000
--- a/doc/DocBook/docbook.css
+++ /dev/null
@@ -1,16 +0,0 @@
-body {
-	font-family:		sans-serif;
-}
-
-.programlisting {
-	font-family:		monospace;
-	font-size:		1em;
-	display:		block;
-	padding:		10px;
-	border:			1px solid #aaa;
-	color:			#000;
-	background-color:	#eee;
-	overflow:		auto;
-	margin:			1em 0em;
-	border-radius:		6px;
-}