neovim: Drop image-nvim for now

image-nvim is currently broken in nixpkgs, however it should be fixed
with an open pull request.

home/neovim.nix

@@ -409,34 +409,6 @@ in
           }
         '';
       }
-      {
-        plugin = image-nvim;
-        type = "lua";
-        config = /* lua */ ''
-          require("image").setup({
-            backend = "kitty",
-            integrations = {
-              markdown = {
-                enabled = true,
-                sizing_strategy = "auto",
-                download_remote_images = false,
-                clear_in_insert_mode = true,
-              },
-              neorg = {
-                enabled = false,
-              },
-            },
-            max_width = 600,
-            max_height = 400,
-            max_width_window_percentage = 40,
-            max_height_window_percentage = 50,
-            kitty_method = "normal",
-            kitty_tmux_write_delay = 10,
-            window_overlap_clear_enabled = false,
-            window_overlap_clear_ft_ignore = { "cmp_menu", "cmp_docs", "" },
-          })
-        '';
-      }
       {
         plugin = git-blame-nvim;
         type = "lua";