Change to semantic chunking

apps/ai_tutor/config/config.yml

@@ -51,9 +51,9 @@ splitter_options:
   split_by_token : True # bool
   remove_leftover_delimiters: True # bool
   remove_chunks: False # bool
-  chunking_mode: 'semantic' # str [fixed, semantic]
-  chunk_size : 300 # int
-  chunk_overlap : 30 # int
+  chunking_mode: 'fixed' # str [fixed, semantic]
+  chunk_size : 1000 # int
+  chunk_overlap : 100 # int
   chunk_separators : ["\n\n", "\n", " ", ""] # list of strings
   front_chunks_to_remove : null # int or None
   last_chunks_to_remove : null # int or None