plugins: configure zen mode to be zenier

- Removes the sign column and disables the git sign plugin.

Co-Authored-by: iGor milhit <igor@milhit.ch>

lua/custom/plugins/zen-mode.lua

@@ -20,7 +20,16 @@ return {
       options = {
         -- Disable line numbering.
         number = false,
+        signcolumn = "no",
       },
     },
+    plugins = {
+      options = {
+        enabled = true,
+        ruler = false,
+        showcmd = false,
+      },
+      gitsigns = { enabled = false },
+    },
   },
 }