Update result node version and npm dependencies

[BretFisher]

The result Node.js app was years out of date, and also had known vulnerabilities. This PR has a list of improvements and fixes that I've been using in my own version for months and in my Docker for Node.js course. I tried to make minimal changes with these goals:

• Use the current LTS release of Node.js
• Update dependency packages to their latest releases (js refactor required)
• Improve Dockerfile readability and more closely follow best practices

Changes include:

• Use latest angular 1.4
• To match other .js loading patterns in this repo, don't use a CDN angular, but rather a local copy in case examples are used offline or in large classrooms with slow internet.
• The result app was years out of date with node and npm packages, and required multiple changes to use the currently supported socket.io and postgres libs.
• Minimal changes to server.js to support change in postgres driver syntax.
• A few minor changes to Dockerfile to improve readability and conform to docker best practices.
• Change Dockerfile to use npm ci to ensure future builds don't break due to the difference between package.json and package-lock.json. ci only uses package-lock.json so builds will use the versions we know to work.
• Change Dockerfile COPY to include package-lock.json in docker build.

Note: A separate PR #139 will prevent node_modules from being included in git commits and docker builds.

[BretFisher]

Changed from node:10-alpine to node:10-slim to work around a npm+alpine bug that is preventing Docker's Jenkins PR builder from completing. Other PR's are failing too, but I can rebase them once this PR is merged.