chore(sync-files): update sync files source of mkdocs (autowarefoundation#3980)

chore(sync-files): update sync files for mkdocs

Signed-off-by: Takagi, Isamu <isamu.takagi@tier4.jp>

Author: isamu-takagi

.github/sync-files.yaml

@@ -89,7 +89,8 @@
   files:
     - source: .github/workflows/deploy-docs.yaml
     - source: .github/workflows/delete-closed-pr-docs.yaml
-    - source: mkdocs.yaml
+    - source: mkdocs-base.yaml
+      dest: mkdocs.yaml
       pre-commands: |
         sd "Autoware Documentation" "Autoware Universe Documentation" {source}
         sd "autoware-documentation" "autoware.universe" {source}