env: enable home-manager-help command; add libsecret to env

modules/universal/env/default.nix

@@ -13,6 +13,7 @@
     EDITOR = "vim";
     # git claims it should use EDITOR, but it doesn't!
     GIT_EDITOR = "vim";
+    # TODO: these should be moved to `home.sessionVariables` (home-manager)
     # Electron apps should use native wayland backend:
     #   https://nixos.wiki/wiki/Slack#Wayland
     # Discord under sway crashes with this.

modules/universal/env/home-manager.nix

@@ -79,6 +79,10 @@ in
     # see: https://github.com/nix-community/home-manager/issues/589#issuecomment-950474105
     home-manager.users.colin = let sysconfig = config; in { config, ... }: {
 
+      # run `home-manager-help` to access manpages
+      # or `man home-configuration.nix`
+      manual.html.enable = true;
+
       home.packages = pkglist cfg.extraPackages;
       wayland.windowManager = cfg.windowManager;
 

modules/universal/env/home-packages.nix

@@ -11,6 +11,7 @@ let
     ifuse
     ipfs
     libimobiledevice
+    libsecret  # for managing user keyrings
     lm_sensors  # for sensors-detect
     lshw
     ffmpeg