refactor: Cleanup (#21)

* refactor(routes): remove unused sitemap route

* style(comments): enforce consistent comment style

* style(exports): enforce consistent export style

* chore: Add jsDoc for contentful service

* chore: Add jsDoc for contentful service \n \n closes #23

* refactor(app): move query parameter comment to right position and mention comment route middleware

* test(npm): add temporary test script

* refactor(middlewares): split up bootstrap middleware - fixes #23759

* refactor(cookies): use constances to give context the maxAge cookie setting

* refactor(variables): use more descriptive names for variables

* space became spaceId when it was just the id not the full space instance
* all (access) token variable name variants became [api-type]Token
* all clients are now called deliveryClient or previewClient
* cpa and cda only remain when they are used as actual API id
* env variables names adjusted

* perf(helpers): only run marked when content is not empty

* refactor(comments): fix typos

* refactor(comments): add hint why error is logged to console in settings

* chore: Add comments to routes and services

* refactor(requires): order and group requires

* fix(settings): add validation for wrong preview token

* chore: Add comments to routes

* chore: fix typo

* chore: console.error -> throw

* chore: move cookie name to a constant

* chore: Fix app.js comment

* typo: removing t

* chore: typos

* chore: removed unnecessary comment line sign

* chore: newline for readabillity

* chore: remove dangling `t`

* chore: remove `t`, add `l`

* chore: typos

* Fleshed out title

* build(npm): remove unused dependencies

* build(npm): upgrade to latest stable contentful sdk

* chore: Addressing David feedbak

* fix(credentials): update to match the new space

* chore: Addressing code review comments

* chore: Addressing code review comments

* chore: res -> response, req-> request

* chore: include exactly what we need

* chore: Address JPs comments

* chore: Address JPs comments

* chore: Address Fredericks comments

* chore: Address Fredericks comments

* fixup! chore: Address Fredericks comments

* fixup! fixup! chore: Address Fredericks comments

* fixup! fixup! fixup! chore: Address Fredericks comments

* fixup! fixup! fixup! fixup! chore: Address Fredericks comments

* fixup! fixup! fixup! fixup! fixup! chore: Address Fredericks comments

* fixup! fixup! fixup! fixup! fixup! fixup! chore: Address Fredericks comments

bin/www

@@ -1,46 +1,42 @@
 #!/usr/bin/env node
 
 /**
- * Module dependencies.
+ * Module dependencies
  */
-
 const app = require('../app')
 const http = require('http')
-/**
- * Get port from environment and store in Express.
- */
 
+/**
+ * Get port from environment and store in Express
+ */
 const port = normalizePort(process.env.PORT || '3000')
 app.set('port', port)
 
 /**
- * Create HTTP server.
+ * Create HTTP server
  */
-
 const server = http.createServer(app)
 
 /**
- * Listen on provided port, on all network interfaces.
+ * Listen on provided port, on all network interfaces
  */
-
 server.listen(port)
 server.on('error', onError)
 server.on('listening', onListening)
 
 /**
- * Normalize a port into a number, string, or false.
+ * Normalize a port into a number, string, or false
  */
-
 function normalizePort (val) {
   const port = parseInt(val, 10)
 
   if (isNaN(port)) {
-    // named pipe
+    // Named pipe
     return val
   }
 
   if (port >= 0) {
-    // port number
+    // Port number
     return port
   }
 
@@ -48,9 +44,8 @@ function normalizePort (val) {
 }
 
 /**
- * Event listener for HTTP server "error" event.
+ * Event listener for HTTP server "error" event
  */
-
 function onError (error) {
   if (error.syscall !== 'listen') {
     throw error
@@ -60,7 +55,7 @@ function onError (error) {
     ? 'Pipe ' + port
     : 'Port ' + port
 
-  // handle specific listen errors with friendly messages
+  // Handle specific listen errors with friendly messages
   switch (error.code) {
     case 'EACCES':
       console.error(bind + ' requires elevated privileges')
@@ -76,9 +71,8 @@ function onError (error) {
 }
 
 /**
- * Event listener for HTTP server "listening" event.
+ * Event listener for HTTP server "listening" event
  */
-
 function onListening () {
   const addr = server.address()
   const bind = typeof addr === 'string'