startup tweaks and README additions (#512)

[artoonie]

This pull request is the squashed forked pull request from slhudson:chore/readme (#512). It is needed to allow running the Heroku CI from forks. This workflow is a work-in-progress and I welcome other suggestions to get the Heroku fork to work. See details here: heroku/roadmap#322

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• adds packages needed on installation

• create package-lock.json

• moves the template .env file out of the README and into infra/

• rearranges README

moves examples and oembed into the intro section, which is focused on users who don't want to clone the repo

consolidates movie details at the bottom so first-time users can focus on getting the server running

• relabel README sections

• creates script to get API key and store it in .env

(1) adds the API credentials and key to the .env.template

(2) creates get-api-key.sh (modeled after serve.sh) to request the API key and store it in .env

(3) modifies the README accordingly

• adds some whitespace to README for readability

• validates token based on length

as in testRestApiExampleCode.py

• removes package-lock.json

I see now where these values are stored in package.json

• adds .DS_store to .gitignore

• adds a script to create a user for local, offline use

• adds a script to create a user for local, offline use

• README typo fixes

• removes get-api-key.sh from this branch

• Revert "Merge branch 'chore/readme' of https://github.com/slhudson/rcvis into chore/readme"

This reverts commit 4527891, reversing changes made to 57ee579.

• Update README.md

• Update infra/.env.template

• Update infra/.env.template

• remove HTML line breaks from README

• remove API parameters from .env.template

• Update requirements-core.txt

• Remove recommendation to install postgresql

• prompts the creation of an admin user in serve.sh

• improves serve.sh comments

• Update scripts/serve.sh

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.67%. Comparing base (23570b3) to head (ca5a79d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
+ Coverage   87.86%   96.67%   +8.80%     
==========================================
  Files         116      121       +5     
  Lines        5086     5833     +747     
==========================================
+ Hits         4469     5639    +1170     
+ Misses        617      194     -423     

Files with missing lines	Coverage Δ
electionpage/tests.py	100.00% <ø> (ø)

... and 22 files with indirect coverage changes

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