feat: Import secretes from secrets.yml

[flooxo]

Description

I have implemented a new function so that it is now possible to import secrets from a secrets.yml file using the keyword !secret.

When loading the config, the corresponding key is loaded with the token from the secrets.yml file and replaced everywhere in the config.yml file

Fixes #609

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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