feat(tazjin/emacs): add zetteldeft & deft to prepare for showdown

The buildup to the showdown of org-roam vs. zetteldeft.

I can never quite get into org, but I wanna find a solution to the
problem I think I have which I think these solve

Change-Id: I03f7ee63b0af8dc3f8c52ad6fa4d6fa5048540bd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5644
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/tazjin/emacs/default.nix

@@ -32,6 +32,7 @@ pkgs.makeOverridable
       counsel
       counsel-notmuch
       d-mode
+      deft
       direnv
       dockerfile-mode
       eglot
@@ -90,6 +91,7 @@ pkgs.makeOverridable
       xelb
       yaml-mode
       yasnippet
+      zetteldeft
       zoxide
 
       # Wonky stuff