Create UI

[scoltman]

This work depends on #11

Create a simple UI that allows users to:

• create/delete/get a transcript from a given youtube url
• view a list of recently created transcripts
• when viewing a transcript periodically check status and update to show any claims that have been found.

UI will be based on the following api contract:

GET /transcripts
200, [{
  id: string
  title: string
  url: string
}]

POST /transcripts 
201, {
  id: string
}

GET /transcripts/<string:id>
200, {
  id: string
  title: string
  url: string
  metadata: string
  transcript: string
}

404, ""

DELETE /transcripts/<string:id>
204, ""

GET /transcripts/<string:id>/status
200, {
  status: string (done|processing|error)
}

404, ""

GET /inferred_claims/<string:id>
200, [{
  id: number
  video_id: text
  claim: text
  label: text
  model: text
  offset_ms: number
}]