Allow name option in secretFile submodule

[Gerschtli]

This follows common patterns used in nixpkgs and enables a bit more flexibility when using the homeage module.

[jordanisaacs]

The nix functions I am using for generating the scripts utilize the name attribute. So this setting isn't actually doing anything currently as nothing references it. Would need to update those functions to instead utilize this new option.

[jordanisaacs]

List of spots that need to be changed (github doesn't let me comment on unchanged lines ugh). Switch from using name to just the config:

• decryptSecret (line 26, and all uses of it) - remove the use of name as a parameter
• mkServices (line 337-340)
• default for path (line 165)

[Gerschtli]

The longer I think about it, the less sense makes my change TBH. Not sure what you think. Because why would the key and the name option ever differ. I came up with this idea because of the way I use the module but in the end, I don't think it is worth the complexity. Feel free to reopen if you see it differently. :)