[conf] Simplify

Author: SilverRainZ

conf.py

@@ -53,6 +53,8 @@
     'sphinx_copybutton',
     'sphinxcontrib.youtube',
     'sphinxnotes.extweb',
+    'sphinx_design',
+    'sphinx_simplepdf', # .. pdf-include::
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -175,7 +177,7 @@
 # documentation.
 html_extra_path = ['robots.txt', 'LICENSE']
 
-# -- Pre extension configuration ---------------------------------------------------
+# -- Per-extension configuration ---------------------------------------------------
 
 extensions.append('sphinxnotes.mock')
 mock_directives = []
@@ -248,8 +250,6 @@
         'c': ['man/.*'],
     }
 
-extensions.append('sphinx_design')
-
 if D.is_public():
     extensions.append('sphinxnotes.isso')
     isso_url = 'https://comments.silverrainz.me:30500'
@@ -351,9 +351,6 @@
     # Speed up local build (prevent read git timestamp).
     extensions.append('sphinx_last_updated_by_git')
 
-# For .. pdf-include:: directive.
-extensions.append('sphinx_simplepdf')
-
 if D is D.Local:
     # Speed up local incremental HTML build (may cause document inconsistencies).
     extensions.append('sphinxnotes.fasthtml')