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>

sourced/filesystem/cdpath.nu

@@ -0,0 +1,36 @@
+def-env c [dir = ""] {
+    let default = if $nu.os-info.name == "windows" {
+        $env.USERPROFILE
+    } else {
+        $env.HOME
+    }
+
+    let complete_dir = if $dir == "" {
+        $default
+    } else {
+        $env.CDPATH
+        | reduce -f "" { |$it, $acc| if $acc == "" {
+            let new_path = ([$it $dir] | path join)
+            if ($new_path | path exists) {
+                $new_path
+            } else {
+                ""
+            }
+        } else { $acc }}
+    }
+    
+    let complete_dir = if $complete_dir == "" { 
+        error make --unspanned {msg: "No such path"} 
+    } else if (($complete_dir | path expand | path type) != "dir") {
+        error make --unspanned {msg: "Not a directory"}
+    } else { 
+        ($complete_dir | path expand)
+    }
+
+    cd $complete_dir
+}
+
+# You need to have $env.CDPATH variable declared, my suggestion from config.nu:
+# let-env CDPATH = [".", $env.HOME, "/", ([$env.HOME, ".config"] | path join)]
+# WINDOWS:
+# let-env CDPATH = ["", $env.USERPROFILE, ([$env.USERPROFILE, "AppData\\Roaming\\"] | path join)]

sourced/filesystem/up.nu

@@ -0,0 +1,6 @@
+# Go up a number of directories
+def-env up [
+    limit = 1: int # The number of directories to go up (default is 1)
+  ] {
+    cd ("." * ($limit + 1))
+}