fix(agenix/fish): addign missing ziggy user to agenix and moving fish to nixos in place of home-manager

modules/nixos/programs/fish/up-or-search.fish

@@ -0,0 +1,22 @@
+# Taken from Misterio77 https://github.com/Misterio77/nix-config/blob/main/home/gabriel/features/cli/fish/up-or-search.fish
+# Merge history upon doing up-or-search
+# This lets multiple fish instances share history
+if commandline --search-mode
+    commandline -f history-search-backward
+    return
+end
+if commandline --paging-mode
+    commandline -f up-line
+    return
+end
+
+set -l lineno (commandline -L)
+
+switch $lineno
+    case 1
+        commandline -f history-search-backward
+        # Here we go
+        history merge
+    case '*'
+        commandline -f up-line
+end