refactor: ✨ (#418)

* refactor: ✨ move in one commit

Eveything in modules should probably be changed to `exported` defs.
The idea is to move everything first to keep proper history.

* refactor: 📝 add modules readme (wip)

* refactor: ✨ small move

* refactor: 📝 changed nestring, updated modules readme

* refactor: 📝 to document or not to document

* fix: 🐛 themes

replaced the template to use `main` and regenerated them
from lemnos themes.

* Revert "fix: 🐛 themes"

This reverts commit 4918d3633c8d2d81950a0ed0cfd9eb84241bc886.

* refactor: ✨ introduce sourced

- Created a source `root` in which sourcable demos are stored.
  Some might get converted to modules later on.
- Moved some files to bin too.

* fix: 🐛 fehbg.nu

* fix: 🐛 modules/after.nu

* moved some other stuff around

---------

Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>

modules/prompt/async_git_prompt/prompt.nu

@@ -0,0 +1,31 @@
+# This file contains an example nushell prompt, making use of the async-git-prompt module.
+use async-git-prompt.nu *
+
+def prompt-concat [parts: table] {
+    $parts
+    | where (not ($it.text | is-empty))
+    | each { |it| $"($it.color)($it.text)" }
+    | str join ' '
+}
+
+def prompt-git-branch [] {
+    do -i { git rev-parse --abbrev-ref HEAD | str trim -r}
+}
+
+def prompt-create-left-prompt [] {
+    let pwd = ($env.PWD | str replace $env.HOME '~')
+    prompt-concat [
+        [text color];
+        [pwd (ansi green_bold)]
+        [(prompt-git-branch)  (ansi blue_bold)]
+        [(async-git-prompt-string) (ansi green_bold)]
+    ]
+}
+
+def prompt-create-right-prompt [] {
+    $nothing
+}
+
+let-env PROMPT_COMMAND = { prompt-create-left-prompt }
+let-env PROMPT_COMMAND_RIGHT = { prompt-create-right-prompt }
+let-env PROMPT_INDICATOR = { $" (ansi green_bold)〉" }