feat(ui): Add FAQ page with styled sections and category navigation

[phiro56]

Update FAQ UI

feat(ui): Add FAQ page with styled sections and category navigation

• Move FAQ content from external source to local repository
• Create new FAQ template with left sidebar navigation
• Add styled FAQ sections with collapsible content
• Implement category-based navigation links
• Add review notice banner for pages under review

[stockholmux]

I'll wait to hear about the valkey-doc#329

[stockholmux]

Looks like we're going to port the FAQ from docs to the website repo.

[phiro56]

@stockholmux latest changes include:

1. Keep content/topics/faq.md under version control in this repo. FAQ content is now managed locally, tracked by git, and can be edited directly in your main website repo. No more dependency on the remote valkey-doc repo for FAQ content.

2. Protect Local FAQ from Being Overwritten. By adding a check in build/init-topics-and-clients.sh to skip faq.md, we ensure that the build script will never overwrite your local FAQ when it creates or updates other topic stubs.

[stockholmux]

This doesn't seem like an approach that will be easy to update or use.

Can we use a Zola section and page with render = false?

Ideally, each FAQ item is built from it's own markdown file: the question would be a front matter item, and the answer would be the body of the file. The FAQ categories would be a taxonomy.

This would make it easy to update and add more. Once the FAQ is ported over, we can just get rid of the file on valkey-doc

[phiro56]

@stockholmux
New location: content/topics/faq/
Index file: content/topics/faq/_index.md - serves as the section container with render = false
Individual Q&A files: Each question gets its own markdown file in the faq/ subdirectory
HTML: Removed from md files