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/aliases/README.md

@@ -0,0 +1,9 @@
+# Custom aliases
+
+This current directory provides custom aliases. They can be used by importing their exported aliases via:
+
+```nushell
+use path/to/<command>/<command>-aliases.nu *
+```
+
+With `path/to/<command>` being either the relative path of the file to your current working directory or its absolute path.