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/ssh/README.md

@@ -0,0 +1,43 @@
+# SSH completions
+
+A Nushell extern definition and completers for the ssh command.
+
+This module provides extern definitions for most of the ssh command options and flags.
+
+## Usage
+
+Simply import the extern definitions with
+
+```nu
+source path/to/ssh-completions.nu
+```
+
+This script will parse `/etc/ssh/ssh_config` and `~/.ssh/config` to fetch SSH config hosts.
+
+Given the following config:
+
+```
+Host my-ip
+    HostName 192.168.50.237
+Host mydomain
+    HostName mydomain.example.com
+Host no.hostname
+    ProxyCommand ssh -q -W %h:%p office
+Host my-domain-2
+    HostName mydomain-2.example.com
+Host my_domain_3
+    HostName mydomain_3.example.com
+```
+
+
+When you press the tab key, it will display:
+
+```
+❯ | ssh
+my-ip             192.168.50.237
+mydomain          mydomain.example.com
+no.hostname
+my-domain-2       mydomain-2.example.com
+my_domain_3       mydomain_3.example.com
+
+```