DOC: Deprecated pdoc param search_query -> google_search_query

Author: kernc

doc/pdoc_template/config.mako

@@ -6,7 +6,7 @@
     sort_identifiers = True
     show_type_annotations = False
     show_source_code = False
-    search_query = '''
+    google_search_query = '''
         inurl:kernc.github.io/backtesting.py
         inurl:github.com/kernc/backtesting.py
     '''