mime: extract declaration from implementation

Maybe this should be made into a separate package later.

user/desktop-entries.nix

@@ -0,0 +1,58 @@
+{ config, pkgs, lib, ... }: {
+  xdg.desktopEntries = {
+    kak = {
+      name = "Kakoune";
+      genericName = "Text Editor";
+      comment = "Edit text files";
+      exec = "kak %F";
+      terminal = true;
+      type = "Application";
+      icon = "kak.desktop";
+      categories = [ "Utility" "TextEditor" ];
+      startupNotify = true;
+      mimeType = [
+        "text/english"
+        "text/plain"
+        "text/x-makefile"
+        "text/x-c++hdr"
+        "text/x-c++src"
+        "text/x-chdr"
+        "text/x-csrc"
+        "text/x-java"
+        "text/x-moc"
+        "text/x-pascal"
+        "text/x-tcl"
+        "text/x-tex"
+        "application/x-shellscript"
+        "text/x-c"
+        "text/x-c++"
+      ];
+      settings = {
+        Keywords = "Text;editor;";
+        TryExec = "kak";
+      };
+    };
+    neomutt = {
+      name = "Neomutt";
+      genericName = "Email Client";
+      comment = "View and Send Emails";
+      exec = "neomutt %U";
+      terminal = true;
+      type = "Application";
+      icon = "mutt";
+      categories = [ "Network" "Email" ];
+      startupNotify = false;
+      mimeType = [ "x-scheme-handler/mailto" ];
+      settings = { Keywords = "Mail;E-mail;"; };
+    };
+    down_meme = {
+      name = "DownMeme";
+      genericName = "Download memes";
+      exec = "down_meme";
+      terminal = true;
+      type = "Application";
+      icon = "download";
+      categories = [ "Network" ];
+    };
+  };
+}