Fix yamllint errors: trailing spaces, blank lines and newline at end of file

Allow aligned values after a colon (the bedroom lamp presets).

.yamllint.yml

@@ -25,3 +25,7 @@ rules:
 
   comments:
     require-starting-space: false
+
+  # Aligned values (e.g. the bedroom lamp presets) are intentional
+  colons:
+    max-spaces-after: -1