Changed . token to _dot

This change allows the dotfiles to work with chezmoi (e.g: on windows)
and improves grepability with neovim/telescope

dot_config/nushell/nu_scripts/benchmarks/fibonacci.nu

@@ -0,0 +1,24 @@
+#!/usr/bin/env nu
+# This benchmark covers the evaluation performance of some very simple, iterative Nushell code that
+# doesn't require a bunch of calls into nested closures and doesn't rely on commands to do any
+# heavy lifting.
+#
+# Originally added by @devyn to show what absolute best case performance for IR evaluation can look
+# like. Not super representative of normal Nushell code.
+
+use std bench
+
+def fib [n: int] {
+  mut a = 0
+  mut b = 1
+  for _ in 2..=$n {
+    let c = $a + $b
+    $a = $b
+    $b = $c
+  }
+  $b
+}
+
+def main [] {
+  print (bench -n 1000 { 0..50 | each { |n| fib $n } } | reject times)
+}