This PR is part of porting all old scripts #221 and ports `fun` folder
<details><summary>Summary</summary>
### star.nu
```yaml
from: before_v0.60/fun/star.nu
to: modules/fun/star.nu
```
### spark.nu
The script has already been ported. I've removed old version.
```yaml
from: before_v0.60/fun/spark.nu
to: sourced/fun/spark.nu
functions:
spark: sourced/fun/spark.nu:1:spark
```
### life.nu
```yaml
from: before_v0.60/fun/life.nu
to: modules/fun/life.nu
```
### lisp_mode.nu
There is a problem with this module because `-` is not allowed in names
anymore, however `def "-"` is a valid syntax, but you will be unable to
call this function.
```yaml
from: before_v0.60/fun/lisp_mode.nu
to: sourced/fun/lisp_mode.nu
```
### nyancat.nu
I also fixed animation frames from https://github.com/klange/nyancat
```yaml
from: before_v0.60/fun/nyancat.nu
to: modules/fun/nyancat.nu
```
</details>
* 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>
