Add Newcomers form to community website

The form should me created in a manner to allow users to join the community with performing some rudimentary checks. Using netlify forms, the submissions will be saved on netlify itself and a cron job should be defined in coala-webservices to fetch all such submissions and run the checks on each submission. Passing the checks, will send an invite to the user else an email will be sent informing the errors to it.

Start by locating the community website form and the coala-webservices entry points for scheduled jobs, then review how existing submissions, checks, invites, and email notifications are handled. Done means the Netlify form accepts submissions, a cron job fetches them, checks determine the outcome, and users receive either an invite or an error email.

Written by the indexing model from the issue text.