Support https://podcastindex.org/

[pedrojvaz]

Is your feature request related to a problem? Please describe. Easier to find podcasts

Describe the solution you'd like Integration with https://podcastindex.org/

Describe alternatives you've considered

Additional context

[y20k]

@pedrojvaz

Podcastindex will be the default search provider in the next version of Escapepod. I really like the service. It is fast and responsive and free.