Add copy button

[blanchardjeremy]

Mainly:

• Adds copy button

Also:

• Cleans up package.json scripts to not call npm install
• Add cleaner way to prevent browser caching of webpack while in development
• Move watch options into webpack

[dmuth]

This is all very good stuff, thanks for contributing it!

Because I have testing to do, I set up branch https://github.com/dmuth/diceware/tree/pr-57-test-branch with your commits in them, and a couple of things that I am tweaking related to that.

Once I finish testing, I'll deploy, merge that branch to main, and provide an update here.

Best,

-- Doug

[dmuth]

Okay, these changes were rolled in to #59. However, a new problem asserted itself, which I am working on in #60.

Thanks once again for the contribution, the copy button is a nice little feature for the app!

-- Doug