Indexer script should be in its own repository

[caufieldjh]

Describe the desired behavior

The multi_indexer script used to set up index pages on the remote (https://github.com/Knowledge-Graph-Hub/kg-idg/blob/master/multi_indexer.py) doesn't really belong here:

• It can be used for KG-Hub projects in general
• It has its own dependencies (like pystache)

It could go somewhere else:

• In the KG-Hub project template
• In the main KG-Hub repo, along with the manifest generator (https://github.com/Knowledge-Graph-Hub/knowledge-graph-hub.github.io)
• With NEAT (though not only with NEAT)
• In its own repo, called as a dependency

[caufieldjh]

Done - see https://github.com/Knowledge-Graph-Hub/multi-indexer - but leaving this open until KG-IDG can bring it in as a dependency.

[caufieldjh]

Brought into the Jenkinsfile.