overview-manual: convert configuration-compile-autoreconf.png to svg

- Convert the png file to an SVG file
- Add the UNPACKDIR reference.
- Remove ${PR} from WORKDIR value, after cc83e4548465 ("bitbake.conf:
  Drop PE and PR from WORKDIR and STAMP") on OE-Core.
- Change S value to BP (equal to ${BPN}-${PV}, but more accurate).

(From yocto-docs rev: f24b00200ac49cda07e4c77e3e1b161a5b78b006)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/overview-manual/concepts.rst

@@ -805,7 +805,7 @@ After source code is patched, BitBake executes tasks that configure and
 compile the source code. Once compilation occurs, the files are copied
 to a holding area (staged) in preparation for packaging:
 
-.. image:: figures/configuration-compile-autoreconf.png
+.. image:: svg/configuration-compile-autoreconf.*
    :width: 100%
 
 This step in the build process consists of the following tasks: