Remove secret from connection string

[Toinne]

Within the database access file, a secret is hardcoded.
This allows the entire internet to access and modify the database.

Readeer/api/data-access/mangodbAccess.js

Line 5 in 95e935f

'mongodb+srv://HYF-FP-G1:K9i8lCCRD1LqYY2u@hfycluster.n96tz.mongodb.net/myFirstDatabase?retryWrites=true&w=majority';

Acceptance criteria:

• Remove secret
• Add support for loading in the secret through an environmental file