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. 

dot_config/nushell/nu_scripts/modules/rbenv/rbenv.nu

@@ -0,0 +1,38 @@
+# rbenv
+export-env {
+    load-env {
+        PATH: ($env.PATH | split row (char esep) | prepend [$"($env.HOME)/.rbenv/bin" $"($env.HOME)/.rbenv/shims"])
+        RBENV_VERSION: ""
+        RBENV_VERSION_OLD: ""
+        RBENV_SHELL: "nu"
+    }
+}
+
+export def --env main [
+	command?: string@'nu-complete rbenv',
+	...args
+] {
+    let new_env = if $command in ["rehash", "shell"] {
+        # implement each on indiviudaly e.g.
+        if $command == "shell" {
+            { RBENV_VERSION_OLD: $env.RBENV_VERSION RBENV_VERSION: $args.0 }
+        } else {
+            error make { msg: $"`($command)` command is not supported yet" }
+        }
+    } else {
+    	if ($command | is-empty) {
+    		^rbenv
+    	} else {
+        	^rbenv $command $args
+    	}
+        {}
+    }
+    load-env $new_env
+}
+
+def 'nu-complete rbenv' [] {
+    ^rbenv help
+    | lines
+    | where ($it | str starts-with "   ")
+    | each {|entry| $entry | split row ' ' | get 0 }
+}