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/cool-oneliners/README.md

@@ -0,0 +1,19 @@
+# cool oneliners
+
+Capturing oneliners to and from the nushell Discourse channel `#cool-oneliners`.
+
+Consider these a living library.
+Or an ongoing story of how people actually use `nu`.
+
+## Naming and script requirements
+
+- the filename should be an abbreviation of the general topic of the script
+  For example:
+
+  ```sh
+  git_batch_extract.nu
+  ```
+
+- the script should have two lines
+  - the first line should be a comment describing the script's purpose
+  - the second line should be the cool oneliner