Improve test data organization and update correspoding conftests

- Put test data for each content type into separate directories
- Makes config.yml for docker and local host consistent
  - Prepending tests to /data in sample_config.yml makes application
    run on local host using test data
  - Allows mounting separate volume for each content type in docker-compose
- Ignore gitignore to only add tests content, not generated models or embeddings

tests/data/music/music.org

@@ -0,0 +1,18 @@
+* The Beatles - Across The Universe                          :60s:BRITISH:POP:
+  :PROPERTIES:
+  :TYPE:     song
+  :END:
+  :LOGBOOK:
+  ENQUEUED: [1984-04-01 Sun 00:00]
+  :END:
+
+* Ram Narayan                                       :INDIAN:CLASSICAL:SARANGI:
+** Ram Narayan - Raag Kirwani Alap
+   :PROPERTIES:
+   :TYPE:     song
+   :QUERY:    Raga Kirvani (feat. Suresh Talwalkar, François Auboux) (Alap)
+   :CATEGORY: youtube
+   :END:
+   :LOGBOOK:
+   ENQUEUED: [1984-04-01 Sun 00:00]
+   :END: