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/sourced/cool-oneliners/README.md

@@ -0,0 +1,19 @@
+# cool oneliners
+
+Capturing oneliners to and from the nushell community.
+
+Consider these a living library.
+Or an ongoing story of how people actually use `nu`.
+
+## Naming and script requirements
+
+- the filename should be an abbreviation of the general topic of the script
+  For example:
+
+  ```sh
+  git_batch_extract.nu
+  ```
+
+- the script should have two lines
+  - the first line should be a comment describing the script's purpose
+  - the second line should be the cool oneliner