Review eslint config (#3269)

- Remove "prettier" from plugin array, because it's already enabled by
"plugin:prettier/recommended"
- Remove "jsdoc" from plugin array, because it's already enabled by
"plugin:jsdoc/recommended"
- Enable recommended import rules
- Add two additional import rules

Note: To avoid overloading this PR I'll tackle the jest part with
another PR after this one has been dealt with.

js/app.js

@@ -12,6 +12,7 @@ const fs = require("fs");
 const path = require("path");
 const envsub = require("envsub");
 const Log = require("logger");
+
 const Server = require(`${__dirname}/server`);
 const Utils = require(`${__dirname}/utils`);
 const defaultModules = require(`${__dirname}/../modules/default/defaultmodules`);