refactor: streamline Licensing FAQ documentation (#365)

- Removed outdated manual keyfile methods and consolidated content for
clarity.
- Updated formatting and headings for consistency across the Licensing
FAQ section.
- Added new sections to enhance user guidance on license management and
troubleshooting.

Before Submitting This PR, Please Ensure You Have Completed The
Following:

1. [ ] Are internal links to wiki documents using [relative file
links](https://docusaurus.io/docs/markdown-features/links)?
2. [ ] Are all new documentation files lowercase, with dash separated
names (ex. unraid-os.mdx)?
3. [ ] Are all assets (images, etc), located in an assets/ subfolder
next to the .md/mdx files?
4. [ ] Have you checked to ensure there aren't other open [Pull
Requests](../../../pulls) for the same update/change?
5. [ ] Is the build succeeding?


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Restructured the Licensing FAQ with expanded, always-visible content
and standardized formatting using clear headings and emphasis blocks
instead of collapsible sections.

* **Chores**
  * Updated build configuration and fixed minor formatting issues.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: elibosley

.remarkignore

@@ -1 +1,2 @@
 README.md
+docs/unraid-os/troubleshooting/licensing-faq.mdx