As an admin, I want to manage indexing of media into Feluda

[dennyabrain]

Possible implementation and Ideas are being discussed here - #11
Feel free to add to it before finalizing anything.

[dennyabrain]

We need a page at /app/index where all the datasets are listed along with their aggregate index status.

We can configure an index script to run every 4 hours. But its possible that occasionally an admin want to

1. Try indexing a particular dataset again
2. Prevent its indexing in the subsequent run of the index cron job.
   We need to provide affordances for both in the UI.

A proposed mock of the page is this :