Add Nextcloud custom service

[meonkeys]

Description

This adds support for Nextcloud custom services. My motivation is so I can use this with my own Nextcloud server. This adds no new dependencies.

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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[bastienwirtz]

Hello @meonkeys,
Thanks for this contribution!
A little thing but otherwise it look good 👍

[bastienwirtz]

Sorry for the very very late re-review, everything looks good !