Quote Variables in .env

[stcz]

Declared Variables should be quoted in .env.example as it is best practice.

Problem:

E.g.:

GEODB_PASSWORD=KUAa7h!G&wQEmkS3

(see here)

When the string is interpreted as in ./scripts/init_letsencrypt.sh the & will terminate the command and lead to fail.

It would be better to quote all variables with '.

[Ivan Ivanov]

Fixed in #846 .