Sample dependencies are being added to the root package.json

[renanborgez]

Describe the bug
Some dependencies used in samples are being packaged alongside of webpacker because it is listed in the root package.json and it should be installed only in the respective sample package.json

Expected behavior
Sample dependencies should only be listed in sample package.json's

To Do
Would be nice to make a general cleanup in the dependencies, seems that some could be removed because are not being used anymore.