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/custom-completions/docker/readme.md

@@ -0,0 +1,9 @@
+# Docker Programming Language
+
+This script provides nushell completions for the Docker open source container platform.
+
+[Docker](https://www.docker.com/) is an open source platform that enables developers to build, deploy, run, update and manage containers.
+
+## How to use
+
+Add source path/to/docker-completion.nu to your config.nu ($nu.config-path).