refactor: Change extension entrypoint to sphinxnotes.snippet

Author: SilverRainZ

docs/conf.py

@@ -152,7 +152,7 @@
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('../src/sphinxnotes'))
-extensions.append('snippet.ext')
+extensions.append('snippet')
 
 # DOG FOOD CONFIGURATION START