Move tests out to project root. Use absolute import in project

tests/ directory in project root is more standard.
Just had to use absolute path for internal module imports to get it to
work

tests/data/config.yml

@@ -0,0 +1,11 @@
+content-type:
+  org:
+    input-files: [ "~/first_from_config.org", "~/second_from_config.org" ]
+    input-filter: "*.org"
+    compressed-jsonl: ".notes.json.gz"
+    embeddings-file: ".note_embeddings.pt"
+
+search-type:
+  asymmetric:
+    encoder: "sentence-transformers/msmarco-MiniLM-L-6-v3"
+    cross-encoder: "cross-encoder/ms-marco-MiniLM-L-6-v2"