Remove useless example

examples/example-layout.yaml

@@ -1,24 +0,0 @@
-book:
-  lang: fr
-  encoding: utf8
-  template: layout.tex
-  datadir: "."
-  pictures: yes
-chords:
-  show: yes
-  diagramreminder: important
-  repeatchords: yes
-  lilypond: yes
-
-authors:
-  separators:
-    - "and"
-    - "et"
-content:
-  - section: "Traditional"
-  - "chevaliers_de_la_table_ronde.tsg"
-  - "greensleeves.csg"
-  - "vent_frais.tsg"
-  - section: Example
-  - "example-fr.tsg"
-  - "example-en.tsg"