Update theme path

Change theme path to private repo on gitea and add changes to deploy
action.

.gitea/workflows/staging.yml

@@ -13,6 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          ssh-key: ${{ secrets.THEME_DEPLOY_KEY }}
           submodules: true
 
       - name: Setup Hugo

config/_default/hugo.toml

@@ -3,7 +3,7 @@
 ## -----------------------------------------------
 
 title = 'Bar Filipo'
-theme = "hugo-story"
+theme = "bar-filipo.de-theme"
 copyright = "2024"
 
 ## -----------------------------------------------