fix: released user manual img not showing

Author: Tieqiong

doc/manual/html/readme.txt

@@ -158,7 +158,7 @@
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
-# html_extra_path = []
+html_extra_path = ['images']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

doc/source/conf.py

@@ -13,4 +13,4 @@ Resources used
 - :download:`Nanoparticle structure <manual_resources/Nanoparticle structure.zip>`
 
 .. raw:: html
-    :file: ../manual/html/pdfgui.html
+    :file: manual_resources/pdfgui.html