Recover non-lemnos themes (#902)

Changes: * Custom Nushell `color_config`'s (non-Lemnos) are moved to the `./src/custom-nu-themes` directory and used to generate the main theme files when doing a `./make.nu` * `make.nu` and other scripts (e.g. preview) have been moved to the `src` directory * A separate `README` for the `src` scripts * Main theme `README` updated for clarity * Reordered the theme template, so all themes were regenerated. I'd like to stop doing this ;-) @amtoine Thanks for your suggestions on the `README`. I've pretty extensively changed the flow, so please re-review and let me know how it looks. Also note that I haven't personally tested with Nupm, so please especially review this section. Thanks! @fdncred CC Still planning on working on the preview scripts next. They'll need only slight changes to run (probably a path change), but they can be simplified a bit now, I hope. At the same time, I'll complicate them in other ways ;-). Note that there is a bug in both `nushell-dark` and `nushell-light` that prevented the terminal colors from being updated regardless. You can see that in the existing screenshots, where both those themes simply re-use the previous theme (alphabetically's) background. I haven't fixed this yet.
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diff --git a/themes/README.md b/themes/README.md
@@ -2,80 +2,114 @@
 
 Credit to @lemnos and [all contributors](https://github.com/lemnos/theme.sh/blob/master/CREDITS.md).
 
-## Use a colorscheme
-### Without Nupm
+Note:
 
-To list all the themes, from the root of the repository run:
+* If using Nupm, or the `<package_root>/themes` directory of this package/repository is in your `$env.NU_LIB_DIRS`, then most of the commands below can be run from anywhere on your system.
+* Otherwise, all examples assume they are run from the `<package_root>/themes` directory.
 
-```rust
-ls ./themes/nu-themes
+## Basic usage
+### Activate a colorscheme
+
+```nu
+source nu-themes/<theme>.nu
 ```
 
-To use the `dracula` theme for instance, please run:
+For example, to use the `dracula` theme:
 
-```rust
-source ./themes/nu-themes/dracula.nu
+```nu
+source nu-themes/dracula.nu
 ```
 
 The theme should be activated!
 
-### Using Nupm
+Note that these settings are for the current shell only.  
 
-1. Install [Nupm] by following the [Nupm instructions]
-2. Download the `nu_scripts` repository
+### Making changes permanent
 
-   ```shell
-   git clone https://github.com/nushell/nu_scripts
-   ```
+Add the command above to your `config.nu` file as shown in [the Configuration chapter of The Book](https://www.nushell.sh/book/configuration.html).
 
-3. Activate the `nupm` module with `use nupm`
-4. Install the `nu-scripts` package
+Note that, if not using Nupm or a `NU_LIB_DIR` path, you should use the fully qualified path to the themes directory on your system. For example:
 
-   ```nushell
-   nupm install --path --force nu_scripts
-   ```
+```nu
+source ~/nu_scripts/themes/nu-themes/dracula.nu
+```
 
-   > **Note**
-   > installing the `nu-scripts` package will install `nu-themes` and other modules
+### List all themes
 
-5. Add the following in your config, substituting the `theme_name` as desired:
+Currently, this is done by simply manually listing the contents of the `nu-themes` directory:
 
-   ```nushell
-   source nu-themes/<theme_name>.nu
-   ```
+```nu
+ls <package_root>/themes/nu-themes
+```
+
+## Advanced
 
-## Loading a theme's color_config
+Themes are composed of two parts:
 
-When sourcing the theme, as above, the theme will:
+* A Nushell `color_config` record which is used to set `$env.config.color_config`
+* A command to update your terminal's foreground, background, and cursor colors.  While this assumes that your terminal supports the appropriate OSC codes, the codes need are very basic and should be supported by most any terminal.
 
-* Set Nushell's `$env.config.color_config` to the appropriate theme colors
-* If supported, set your terminal's foreground, background, and cursor colors to match the theme
+You may wish to set the Nushell `color_config` without changing your terminal's colors, or vice-versa. These themes provide additional commands that allow you to accomplish this.
 
-If you would like to do *just* one or the other, you can load a theme's color definition and terminal settings separately.
+**Important:** Notice that while the "Basic usage" above uses `source` to activate the theme, the following examples *import* the theme module with a `use` statement.
 
 ### Load a color_config
 
-For example, to load and use the `tokyo-night` theme's colors:
+For example, to load and use the `tokyo-night` theme's colors without changing the terminal settings:
 
-```nushell
-> use nu-themes/tokyo-night.nu *
-  # Display the values
+#### Display a theme's `color_config` settings
+
+```nu
+> use nu-themes/tokyo-night.nu
 > tokyo-night
-  # Set the color_config to that scheme
+```
+
+#### Activate a Nushell `color_config`
+
+```nu
+> use nu-themes/tokyo-night.nu
 > tokyo-night set color_config
-  # Or
+```
+
+or
+
+```nu
+> use nu-themes/tokyo-night.nu
 > $env.config.color_config = (tokyo-night)
 ```
 
 ### Set terminal colors
 
+Or you can change the terminal settings to use the theme's foreground/background/cursor colors without changing the Nushell `color_config`.
+
 Again, using the `tokyo-night` theme as an example:
 
 ```nushell
-> use nu-themes/tokyo-night.nu *
+> use nu-themes/tokyo-night.nu
 > tokyo-night update terminal
 ```
 
+## Using Nupm
+
+The parent `nu_scripts` package can be installed and updated using [Nupm].
+
+1. Install [Nupm] by following the [Nupm instructions]
+2. Download the `nu_scripts` repository
+
+   ```shell
+   git clone https://github.com/nushell/nu_scripts
+   ```
+
+3. Activate the `nupm` module with `use nupm`
+4. Install the `nu-scripts` package
+
+   ```nushell
+   nupm install --path --force nu_scripts
+   ```
+
+   > **Note**
+   > installing the `nu-scripts` package will install `nu-themes` and other modules
+
 ## Screenshots
 
 Here are [screenshots](./screenshots/README.md) of our themes.

diff --git a/themes/make.nu b/themes/make.nu
diff --git a/themes/nu-themes/3024-day.nu b/themes/nu-themes/3024-day.nu
@@ -1,29 +1,3 @@
-# Update terminal colors
-export def "update terminal" [] {
-    let theme = (main)
-
-    # Set terminal colors
-    let osc_screen_foreground_color = '10;'
-    let osc_screen_background_color = '11;'
-    let osc_cursor_color = '12;'
-
-    $"
-    (ansi -o $osc_screen_foreground_color)($theme.foreground)(char bel)
-    (ansi -o $osc_screen_background_color)($theme.background)(char bel)
-    (ansi -o $osc_cursor_color)($theme.cursor)(char bel)
-    "
-    # Line breaks above are just for source readability
-    # but create extra whitespace when activating. Collapse
-    # to one line
-    | str replace --all "\n" ''
-    | print $in
-}
-
-# Update the Nushell configuration
-export def --env "set color_config" [] {
-    $env.config.color_config = (main)
-}
-
 # Retrieve the theme settings
 export def main [] {
     return {
@@ -110,6 +84,32 @@ export def main [] {
     }
 }
 
+# Update the Nushell configuration
+export def --env "set color_config" [] {
+    $env.config.color_config = (main)
+}
+
+# Update terminal colors
+export def "update terminal" [] {
+    let theme = (main)
+
+    # Set terminal colors
+    let osc_screen_foreground_color = '10;'
+    let osc_screen_background_color = '11;'
+    let osc_cursor_color = '12;'
+
+    $"
+    (ansi -o $osc_screen_foreground_color)($theme.foreground)(char bel)
+    (ansi -o $osc_screen_background_color)($theme.background)(char bel)
+    (ansi -o $osc_cursor_color)($theme.cursor)(char bel)
+    "
+    # Line breaks above are just for source readability
+    # but create extra whitespace when activating. Collapse
+    # to one line
+    | str replace --all "\n" ''
+    | print $in
+}
+
 export module activate {
     export-env {
         set color_config