documentation: Re-write of dev-manual setup chapter

Fixes [YOCTO #11630]

The chapter on setting up YP has been completely re-written to
move towards a "how-to" manual.  This involved touching every
aspect of the chapter.  All subsections now have procedures
surrounding set up stuff.  There are some development sections that
still need fleshed out.

Many, many links and references in other chapters were affected.
These have been fixed.

A couple style-sheet (*.css) files were also updated to support the
"writernotes" style, which renders paragraph text in red.

(From yocto-docs rev: c4c2a6cf575ce5c783b1cc84d9f7e961aebef49c)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/introduction.xml

@@ -594,7 +594,7 @@
         You can set up the Source Directory by cloning a copy of the upstream
         <ulink url='&YOCTO_DOCS_DEV_URL;#poky'>poky</ulink> Git repository.
         For information on how to do this, see the
-        "<ulink url='&YOCTO_DOCS_DEV_URL;#getting-setup'>Getting Set Up</ulink>"
+        "<ulink url='&YOCTO_DOCS_DEV_URL;#working-with-yocto-project-source-files'>Working With Yocto Project Source Files</ulink>"
         section in the Yocto Project Development Manual.
     </para>
 </section>

documentation/ref-manual/ref-development-environment.xml

@@ -333,7 +333,7 @@
             Once you have a local copy of a repository, you can take steps to
             develop locally.
             For examples on how to clone Git repositories, see the
-            "<ulink url='&YOCTO_DOCS_DEV_URL;#getting-setup'>Getting Set Up</ulink>"
+            "<ulink url='&YOCTO_DOCS_DEV_URL;#working-with-yocto-project-source-files'>Working With Yocto Project Source Files</ulink>"
             section in the Yocto Project Development Manual.
         </para>
 

documentation/ref-manual/ref-structure.xml

@@ -14,8 +14,9 @@
 </para>
 
 <para>
-    For information on how to establish a local Source Directory on your development system, see the
-    "<ulink url='&YOCTO_DOCS_DEV_URL;#getting-setup'>Getting Set Up</ulink>"
+    For information on how to establish a local Source Directory on your
+    development system, see the
+    "<ulink url='&YOCTO_DOCS_DEV_URL;#working-with-yocto-project-source-files'>Working With Yocto Project Source Files</ulink>"
     section in the Yocto Project Development Manual.
 </para>