Templates: Adding descriptions to package.json, making config files consistant

[melissamcewen]

Changes

Re: issue #1189

• Adds description to every template package.json
• Refactors all config files in templates to snowpack.config.js with a consistent format

Testing

Local tests ran and passed, one snapshot was updated

Docs

No major changes that need explaining

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[stramel]

Would it be worth maintaining links to the respective sections in the docs for the configs? ie.

"installOptions": {
  /** @see https://www.snowpack.dev/#config.installoptions */
},

or maybe just at the top adding a doc block with a link to the configuration section of the docs? ie.

/**
 * _insert some disclaimer here / note about more information on the config_
 * @see https://www.snowpack.dev/#configuration
 */
module.exports = {
  install: [
    /* ... */
  ],
  // ...

[FredKSchott]

That's a great idea, although since we're looking to move to a multi-page docs site soon I'd rather wait until that's done before adding links, since they'd almost certainly change. Find-and-replace is also easy tho, so I guess I'm 🤷

[FredKSchott]

LGTM overall! left 2 small comments

[FredKSchott]

LGTM!