Remove "export" in **.env**
Remove "export" in **.env**

Since we add `export` using `sed` in `bin/run`, there is no need to add
`export` in **.env** anymore. Also, docker-compose's `env_file` option
does not agree with `export`.

Signed-off-by: John Wu <50f3f01caa053693ce619d596e14b0ff3901ab49@leapoahead.com>

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