chore: drop dotenv devDependency and usage (#82)

The same effect can be had by manually using one of:
    FOO=bar node ...
    env `cat my.env` node ...

README.md

@@ -53,10 +53,6 @@ For a complete list of PostgreSQL environment variables [see the
 official
 documentation](https://www.postgresql.org/docs/9.5/static/libpq-envars.html).
 
-In development, you can create a `.env` file in the root of the project
-containing all your secret environment variables. See
-[dotenv](https://github.com/motdotla/dotenv) for details.
-
 ## Bootstrap
 
 Populate the database with tables and basic data:

package.json

@@ -16,7 +16,6 @@
     "workload": "^2.4.3"
   },
   "devDependencies": {
-    "dotenv": "^8.2.0",
     "standard": "^16.0.3"
   },
   "scripts": {

server/config.js

@@ -1,12 +1,7 @@
 'use strict'
 
 const pkg = require('../package')
-let env = process.env.NODE_ENV || 'development'
-
-if (env === 'development') {
-  require('dotenv').config()
-  env = process.env.NODE_ENV || env // in case dotenv changes NODE_ENV
-}
+const env = process.env.NODE_ENV || 'development'
 
 const conf = module.exports = {
   env: env,