refactor: separate gallery and nds files in public/

public/nds/models/nintendo-ds/license.txt

@@ -0,0 +1,11 @@
+Model Information:
+* title:	Nintendo DS
+* source:	https://sketchfab.com/3d-models/nintendo-ds-934fdde060874d5c99b40cdf1dbb37f2
+* author:	solal.sblt (https://sketchfab.com/Solal.Sebillotte)
+
+Model License:
+* license type:	CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)
+* requirements:	Author must be credited. Commercial use is allowed.
+
+If you use this 3D model in your project be sure to copy paste this credit wherever you share it:
+This work is based on "Nintendo DS" (https://sketchfab.com/3d-models/nintendo-ds-934fdde060874d5c99b40cdf1dbb37f2) by solal.sblt (https://sketchfab.com/Solal.Sebillotte) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)