chore(editorconfig): Add 2 space rule for yml files

Signed-off-by: Joas Schilling <coding@schilljs.com>

.editorconfig

@@ -7,3 +7,7 @@ indent_size = 4
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
+
+[*.yml]
+indent_size = 2
+indent_style = space