feat: Improvements on the "find actor idea" page (#2063)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Adds a collapsible GitHub projects list and minor wording tweaks in
the Open-source libraries inspiration section of the Actor ideas page.
> 
> - **Docs (Actor ideas page)**:
> - Adds a collapsible `<details>` section listing GitHub projects
suitable for Actorization under the "Open-source libraries" section.
> - Tweaks inspiration text to reference the Apify Store open-source
category and the new list.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
6947f11. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: jancurn

sources/academy/build-and-publish/actor-ideas/what_software_an_actor_can_be.md

@@ -55,9 +55,11 @@ Examples:
 - [Monolith](https://apify.com/snshn/monolith)
 - [Crawl4AI](https://apify.com/janbuchar/crawl4ai)
 
-For inspiration, check out the [Open-source category](https://apify.com/store/categories/open-source) in Apify Store.
+For inspiration, check out the [Open-source category](https://apify.com/store/categories/open-source) in Apify Store,
+or the following list:
 
-Here is a short list of open-source projects that might be suitable for turning into Actors:
+<details>
+  <summary>GitHub projects potentially suitable for turning into Actors</summary>
 
 - https://github.com/bytedance/Dolphin
 - https://github.com/google/langextract
@@ -82,6 +84,7 @@ Here is a short list of open-source projects that might be suitable for turning
 - https://github.com/TheAgenticAI/TheAgenticBrowser
 - https://github.com/zcaceres/markdownify-mcp
 
+</details>
 
 :::tip Open Source Fair Share