docs: updates to admin customization docs (#7493)

* updated admin docs

* re-add navigation and parameters sections

* update injection zones

* update cli scripts docs

* added list of injection zones

* add details about widget props

* restructure admin injection zones

www/apps/book/app/advanced-development/custom-cli-scripts/page.mdx

@@ -43,15 +43,12 @@ The function receives as a parameter an object having a `container` property, wh
 
 ## How to Run Custom CLI Script?
 
-To run the custom CLI script, `build` your code then run the `exec` command:
+To run the custom CLI script, run the Medusa CLI's `exec` command:
 
 ```bash npm2yarn
-npm run build
-npx medusa exec ./dist/scripts/my-script.js
+npx medusa exec ./src/scripts/my-script.ts
 ```
 
-Notice that you pass the path to the file in the `dist` directory.
-
 ---
 
 ## Custom CLI Script Arguments
@@ -73,6 +70,5 @@ export default async function myScript ({
 Then, pass the arguments in the `exec` command after the file path:
 
 ```bash npm2yarn
-npm run build
-npx medusa exec ./dist/scripts/my-script.js arg1 arg2
-```
+npx medusa exec ./src/scripts/my-script.ts arg1 arg2
+```