add image to the cover page of the PDF version of the manual

doc/utils/sphinx-config/conf.py.in

@@ -91,7 +91,7 @@ def get_git_info():
     try:
         gitinfo = subprocess.run(['git','describe'],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
         if gitinfo.returncode == 0:
-            git_n_date = gitinfo.stdout.decode().replace('_',' ')
+            git_n_date = gitinfo.stdout.decode().replace('_',' ').replace('patch ','')
     except:
         pass
     return git_n_date
@@ -344,7 +344,7 @@ latex_documents = [
 
 # The name of an image file (relative to this directory) to place at the top of
 # the title page.
-#latex_logo = None
+latex_logo = "_static/lammps-logo-large.jpg"
 
 # For "manual" documents, if this is true, then toplevel headings are parts,
 # not chapters.