secrets: use homeage to manage secrets for home-manager

Instead of using agenix for all the secrets, I can use homeage for
secrets that are related to my user sessions.

Secrets by default will be store under `~/.secrets'. They are encrypted
using `age' and to decrypt them, a key is expected to be located under
`~/.age/key.txt'.

The last place where I was using `pass' (and so GPG too) was for the
secrets for `mbsync': this change adds a secret for fastmail to the
repository and update `mbsync' configuration to use it.

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