Add simple page to link support KB

[KiraLempereur-Spacelift]

Description of the change

Adding a landing page to talk about the support KB and link to it. Includes a screenshot of the support KB page taken today, Jan 06 2026.

Checklist

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• I have reviewed the guidelines for contributing to this repository.
• The preview looks fine.
• The tests pass.
• The commit history is clean and meaningful.
• The pull request is opened against the main branch.
• The pull request is no longer marked as a draft.
• You agree to license your contribution under the MIT license to Spacelift (not required for Spacelift employees).
• You have updated the navigation files correctly:
  • No new pages have been added, or;
  • Only nav.yaml has been updated because the changes only apply to SaaS, or;
  • Only nav.self-hosted.yaml has been updated because the changes only apply to Self-Hosted, or;
  • Both nav.yaml and nav.self-hosted.yaml have been updated.

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Thank you for your contribution! 🙇

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Note

Introduces a dedicated docs page for the Support Knowledge Base and links it from navigation.

• Adds docs/faq/support_kb.md describing the support KB with link and screenshot reference
• Updates navigation in both nav.yaml and nav.self-hosted.yaml to include “❔ Support knowledge base”

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[Daniellem97]

Lgtm