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/modules/rbenv/README.md

@@ -0,0 +1,10 @@
+# rbenv script
+
+This script provides minimal working rbenv setup.
+It can be used by importing its exported commands via:
+
+```
+use path/to/rbenv.nu *
+```
+
+With `path/to` being either the relative path of the file to your current working directory or its absolute path.