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/progress_bar/percent_meter.nu

@@ -0,0 +1,23 @@
+def loading [] {
+    print -n $"Loading (char newline)"
+    0..100 | each { |tick|
+        sleep 50ms
+        # I believe '1000D' means move the cursor to the left 1000 columns
+        print -n $"(ansi -e '1000D')($tick)%"
+    }
+    #show_cursor
+}
+
+def show_cursor [] {
+    print $"(ansi -e '?25h')"
+}
+
+def hide_cursor [] {
+    print $"(ansi -e '?25l')"
+}
+
+def demo_percent_meter [] {
+    hide_cursor
+    loading
+    show_cursor
+}