doc: wikiparser: Use icons from the icons directory

Currently some icons are duplicated between the images/ directory and
images/icons/ directory. De-duplicate and only use the icons from images/icons
directory.

Tests:

- Affected sections/pages of the manual are: Firewall, Hardware and VirtualBox.
Confirm by diffing with manual generated without the code changes.

- Open all affected pages and the full manual page and confirm that images are
loading properly.

- Check all affected pages and the full manual page in FreedomBox interface and
confirm that images are loading properly.

- Check all affected sections in the generated PDF.

- Repeat tests for English and Spanish manuals.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

doc/scripts/wikiparser.py

@@ -553,7 +553,9 @@ def map_local_files(path):
     if 'target=' in path:
         path = path.partition('target=')[2]
 
-    if '/' in path:
+    if path.startswith('icons/'):
+        pass
+    elif '/' in path:
         path = path.rsplit('/', maxsplit=1)[1]
 
     return f'images/{path}'