Add more data centre locations

The full list of locations was generated from the [Cloudflare Status Page](https://www.cloudflarestatus.com/):

```bash
{
  echo 'export const locations = {';
  curl -ks https://www.cloudflarestatus.com/ | grep -- '- (' | while read line; do
    code=$(awk -F '[()]' '{print $2}' <<< "$line");
    city=$(awk -F '[,-]' '{print $1}' <<< "$line");
    echo "  $code: '${city//\'/’}',";
  done | sort;
  echo '}';
} > src/functions/locations.js
```

src/components/monitorDayAverage.js

@@ -1,4 +1,4 @@
-import { locations } from '../functions/helpers'
+import { locations } from '../functions/locations'
 
 export default function MonitorDayAverage({ location, avg }) {
   return (

src/components/monitorStatusHeader.js

@@ -1,5 +1,5 @@
 import config from '../../config.yaml'
-import { locations } from '../functions/helpers'
+import { locations } from '../functions/locations'
 
 const classes = {
   green: