Minor changes to Material Web Components starter kit

[mfoitzik]

Hi Bonnie. I used your starter kit to begin experimenting with the material web components and came across a couple of problems. When I added an additional component I noticed things weren't getting reflected after the compile. Your index file is referencing the dist folder but the webpack config isn't going there. Your repository includes the built dist output files so when you initially clone and build the kit and run it everything looks fine. In summary the changes take care of the dist reference for build but index.html references root assuming for production you would copy the index.html to the dist folder. Also, I gitignore the dist folder and delete the build output files from the repo. Also, I updated the component versions to the current version 1 releases.