ci(docs): use latest as alias (#6352)

Author: mloiseleur

.github/workflows/docs.yaml

@@ -68,5 +68,5 @@ jobs:
       - name: build and push
         run: |
           VERSION="${{ inputs.tag }}"
-          mike deploy $VERSION --push --update-aliases
+          mike deploy $VERSION latest --push --update-aliases
           mike set-default --push latest

mkdocs.yml

@@ -66,6 +66,7 @@ theme:
 extra:
   version:
     provider: mike
+    alias: true
 
 markdown_extensions:
   - meta