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Fix #149 Heroku doesn't pick up changed environment variables

Move the webpack build step from postinstall to start.

This makes bringing up a dyno slower (although the build is faster, so it should be the same total time for a new deployment), but the app picks up changes to environment variables without requiring a re-deploy.

This also brings another couple of benefits:
* `yarn start` runs the latest sources. This is typically what I want; the fact that it doesn't has got me a few times. (`yarn run` is available to just run the production server, without building the client.)
* `yarn install` no longer runs webpack. This was undesireable behavior (although fixing just this could have been accomplished by moving the build from `postinstall` to `heroku-postbuild`).

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