* backend support for new watch system (#134):
- support for watch via redis pubsub and websocket connection to backend
- can support watch from any number of crawler instances to support scaled crawls
- use /archives/{aid}/crawls/{crawl_id}/watch/ws websocket endpoint
- ws: ignore graceful connectionclosedok exception, log other exceptions
- set logging to info to instead of debug for now (debug logs all ws traffic)
- remove old watch apis in backend
- remove old websocket routing to crawler instance for old watch system
- oauth bearer check: support websockets, use websocket object if no request object
- crawler args: replace --screencastPort with --screencastRedis
* support running backend + frontend together on k8s
* split nginx container into separate frontend service, which uses nignx-base image and the static frontend files
* add nginx-based frontend image to docker-compose build (for building only, docker-based combined deployment not yet supported)
* backend:
- fix paths for email templates
- chart: support '--set backend_only=1' and '--set frontend_only=1' to only force deploy one or the other
- run backend from root /api in uvicorn
