[FEAT] Incorporate Let's Encrypt

[pawisoon]

Is this a new feature request?

• I have searched the existing issues

Wanted change

It would be great if we could get Let's Encrypt as part of the setup of projectsend.

Reason for change

Provides SSL enabled service and secure file sharing.

Proposed code change

No response

[github-actions]

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[Roxedus]

This doesn't seem to be function in ProjectSend today, and this is not the place for upstream feature requests.

We do however recommend you to deploy a reverse proxy in front of all the applications you expose on the internet, which also should handle termination of TLS. We offer linuxserver/swag for that purpose, but you are free to use a reverse proxy of your choice.