Add simple page to link support KB (#990)

* Add simple page to link support KB

* Update nav.self-hosted.yaml

Author: KiraLempereur-Spacelift

docs/assets/screenshots/support_kb_site.png

@@ -0,0 +1,9 @@
+# Support knowledge base
+
+When Spacelift customers reach out to support to solve a problem, we create [knowledge base articles](https://support.spacelift.io/) to help others fix the same issue.
+
+You can search for articles related to your problem within the knowledge base or navigate through the categories.
+
+![Support KB site](<../assets/screenshots/support_kb_site.png>)
+
+If you can't find a solution in the docs or support knowledge base, please reach out to our [support team](../product/support/README.md).

docs/faq/support_kb.md

@@ -57,6 +57,7 @@ nav:
       - getting-started/create-stack/README.md
     - Step 4. Invite teammates:
       - getting-started/invite-teammates/README.md
+  - ❔ Support knowledge base: faq/support_kb.md
   - ✋ FAQ: faq/README.md
   - ⭐ Main Concepts:
       - Stack:

nav.self-hosted.yaml

@@ -17,6 +17,7 @@ nav:
       - getting-started/create-stack/README.md
     - Step 4. Invite teammates:
       - getting-started/invite-teammates/README.md
+    - ❔ Support knowledge base: faq/support_kb.md
     - ✋ FAQ: faq/README.md
   - ⭐ Main Concepts:
       - Stack: