feat: open telescope on startup

modules/programs/nvim/new_plugins/telescope.nix

@@ -2,10 +2,29 @@ _:
 
 {
   home-manager.users.moritz.programs.nixvim = {
+    autoCmd = [
+      {
+        event = [ "VimEnter" ];
+        callback.__raw = ''
+          function()
+            if vim.fn.argc() == 0 then
+              require("telescope.builtin").find_files()
+            end
+          end
+        '';
+      }
+    ];
     plugins = {
       telescope = {
         enable = true;
         extensions.fzf-native.enable = true;
+        settings.defaults.__raw = ''
+          require("telescope.themes").get_ivy({
+            layout_config = {
+              height = 0.75
+            }
+          })
+        '';
         keymaps = {
           "<leader>ff" = {
             action = "find_files";