[FEATURE] Add task manager

[shawnthompson]

Required information

Is your feature request related to a problem? Please describe.
We need a npm task manager to work our npm task.

Describe the solution you'd like
something to run npm start as a task manager.

Additional information (optional)

Currently using rpm-run-all

  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "eleventy": "npx eleventy",
    "watch:eleventy": "eleventy --serve",
    "sass-start": "sass src/_scss/base.scss _site/css/da11yn.css",
    "sass-build": "sass --style=compressed src/_scss/base.scss _site/css/da11yn.css",
    "watch:sass": "npm run sass-start -- --watch",
    "start": "npm-run-all sass-start --parallel watch:*",
    "build": "npm-run-all sass-build --parallel eleventy"
  },

Additional context
Suggestion to use gulp, grunt or Webpack

What Tool to Use: webpack vs Gulp vs Grunt vs Browserify

[shawnthompson]

List of what tasks we would like to accomplish with a task manager:

• copy assets
• linting
• test accessibility
• other tests
• code validation
• building prod vs staging
• build watch
• sass
• js (not sure if it's needed)
• clean (delete _site folder for clean build)
• image optimizer
• deployment

Anything else?

[shawnthompson]

New page script related to #114