Add endpoint for reading & updating site deployment script (#562)

* feat(api): Add endpoint for updating site deployment script

- Add PUT /api/projects/{project}/servers/{server}/sites/{site}/deployment-script endpoint
- Add feature tests for successful and failed updates

* added reading deployment script as well

* generate docs

---------

Co-authored-by: Saeed Vaziry <mr.saeedvaziry@gmail.com>

.scribe/endpoints.cache/04.yaml

@@ -29,7 +29,7 @@ endpoints:
     responses:
       -
         status: 200
-        content: '{"success":true,"version":"2.1.0"}'
+        content: '{"success":true,"version":"2.4.0"}'
         headers:
           cache-control: 'no-cache, private'
           content-type: application/json