Add www/py-puppetboard03

Copy www/py-puppetboard02 to www/py-puppetboard03 and update it accordingly.

While here:

• Pass maintainership of www/py-puppetboard02 to puppet@;
• Update CONFLICTS_INSTALL for www/py-puppetboard, www/py-puppetboard02 and www/py-puppetboard03;
• Mark www/py-puppetboard02 as deprectaed, without expiration date for now.

With hat: puppet