Clean up passwords used for local development and unit testing.

[sydseter]

Using .env.example files or replacing visible keys with clearly fake placeholders like DUMMY_KEY_HERE or REPLACE_ME can avoid triggering scanners and still keep things simple for onboarding.

The following need to be replaced with place holder values:

MAS_API_KEY = 8767086b9f6f976g-a8df76
MASTG_API_KEY = 072037ab-1b7b-4b3b-8b7b-1b7b4b3b8b7b
secret_key_base: "LgvNRXYWe539tFQXsMkDuRniXGaiEzTMWUj2GIanun0dlbtV6vPlTGZ/l8qR1V7f"
password: "y9EAY7xeVucjM2yM"

Please make sure it's still possible to run the local tests and start the development environment after the changes.