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/formats/to-number-format.nu

@@ -0,0 +1,68 @@
+export def number-format [
+    num                             # Number to format
+    --thousands_delim (-t) = ' '    # Thousands delimiter: number-format 1000 -t ': 1'000
+    --whole_part_length (-w) = 0    # Length of padding whole-part digits: number-format 123 -w 6:    123
+    --decimal_digits (-d) = 0       # Number of digits after decimal delimiter: number-format 1000.1234 -d 2: 1000.12
+    --denom (-D) = ""               # Denom `--denom "Wt": number-format 1000 --denom 'Wt': 1000Wt
+] {
+
+    let parts = (
+        $num
+        | into string
+        | split row "."
+    )
+
+    let whole_part = (
+        $parts.0
+        | split chars
+        | reverse
+        | reduce -n -f [] {
+            |it, acc| if ((($it.index + 1) mod 3) == 0) {
+                $acc.item
+                | append $it.item
+                | append $thousands_delim
+            } else {
+                $acc.item
+                | append $it.item
+            }
+        }
+        | reverse
+    )
+
+    let whole_part2 = (
+        if ($whole_part | first) == $thousands_delim {
+            ($whole_part | skip 1)
+        } else {
+            $whole_part
+        }
+        | str join ''
+    )
+
+    let whole_part3 = (
+        if $whole_part_length == 0 {
+            $whole_part2
+        } else {
+            $whole_part2
+            | fill -w $whole_part_length -c ' ' -a r
+        }
+    )
+
+    let dec_part = (
+        if ($parts | length) == 1 {
+            "0"
+        } else {
+            $parts.1
+        }
+    )
+
+    let dec_part2 = (
+        if $decimal_digits == 0 {
+            ""
+        } else {
+            $".($dec_part)" | fill -w ($decimal_digits + 1) -c '0' -a l
+        }
+    )
+
+    let out = $"(ansi green)($whole_part3)($dec_part2)(ansi reset)(ansi green_bold)($denom)(ansi reset)"
+    $out
+}