Updating env files on openai:install

[ralphschindler]

This is more of a DX problem.

By the time I went to install openai, I had already renamed my .env to .env.local, additionally .env.example is already gone too.

Both of these situations lead to exceptions during openai:install:

file_get_contents(/app/.env): Failed to open stream: No such file or directory

file_get_contents(/app/.env.example): Failed to open stream: No such file or directory