Ingest darcsden

Summary:

A lister is needed for darcsden, a forge for hosting darcs repositories.

The front page has a list of links to users with public repos:

curl -sL $site | pup 'li.username a attr{href}' | sed "s_^_$site_"

The user pages have a list of public repositories:

curl -sL $user | pup 'a.public-repo attr{href}'

The repo web pages mention the links to the darcs get URLs:

curl -sL $repo | pup 'li.geturl input attr{value}'

Web searching for "darcsden" "built" finds instances, but there is only one instance as far as I can tell, but it contains 2600 public repos, which is probably almost all of the public darcs repos that exist on the web, although there definitely are some more.

https://hub.darcs.net/

This issue is blocked by having a loader for darcs repos (#273).

Plan:

• Implement lister
• #273 Implement loader
• docker: Run lister
• docker: Run loader
• Document lister
• Document loader
• Deploy on staging
• Call for public review
• Deploy on production