Integrate Keystatic to edit twenty.com content (#10709)

This PR introduces Keystatic to let us edit twenty.com's content with a
CMS. For now, we'll focus on creating release notes through Keystatic as
it uses quite simple Markdown. Other types of content will need some
refactoring to work with Keystatic.


https://github.com/user-attachments/assets/e9f85bbf-daff-4b41-bc97-d1baf63758b2

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

.github/workflows/ci-website.yaml

@@ -20,7 +20,7 @@ jobs:
   website-build:
     needs: changed-files-check
     if: needs.changed-files-check.outputs.any_changed == 'true'
-    timeout-minutes: 3
+    timeout-minutes: 10
     runs-on: ubuntu-latest
     services:
       postgres:
@@ -58,7 +58,7 @@ jobs:
           DATABASE_PG_URL: postgres://postgres:postgres@localhost:5432/default
   ci-website-status-check:
     if: always() && !cancelled()
-    timeout-minutes: 1
+    timeout-minutes: 10
     runs-on: ubuntu-latest
     needs: [changed-files-check, website-build]
     steps: