deprecate Ensichat

At the moment, Ensichat is no longer maintained.

• metadata: https://gitlab.com/fdroid/fdroiddata/-/blob/master/metadata/com.nutomic.ensichat.yml
• github notice: https://github.com/Nutomic/ensichat

PROJECT DISCONTINUED

Unfortunately, I won't be able to continue development on Ensichat, due to lack of time. I suggest you give Briar a try instead.

If you wish to take over maintenance of the project, please contact me.

I wonder:

• Can we add a notice to the F-Droid metadata?
• Is there a specific way to do so?

I read

• the metadata reference but there seems no field for deprecation (https://f-droid.org/en/docs/Build_Metadata_Reference/#ArchivePolicy)