Adding a node service for handling sponsorship forms

This PR introduces a node process that handles sponsorship requests from the /community page

The service does not currently auto-start, there are a number of pending issues for this as a result #374, #375, #376.

This fixes #222, fixes #342
YAML format would be:

```yaml
root: "{{ docroot }}"
location1:
  name: /api
  proxy_pass: http://127.0.0.1:8111
```