Rename deploy URL to deployment + update title

docs/deployment/index.md

@@ -1,6 +1,6 @@
 (deployment_guide)=
 
-# Deploying & Hosting Wagtail
+# Deployment & hosting
 
 ```{toctree}
 ---

docs/index.rst

@@ -45,7 +45,7 @@ Index
    advanced_topics/index
    extending/index
    reference/index
-   deploy/index
+   deployment/index
    support
    editor_manual/index
    contributing/index

docs/tutorial/deployment.md

@@ -4,7 +4,7 @@ So far, you've been accessing your site locally. Now, it's time to deploy it. De
 
 To deploy your site, you'll first need to choose a [hosting provider](deployment_guide), then follow their Wagtail deployment guide.
 
-If you're unsure, we have a tutorial for using [Fly.io with Backblaze](../deploy/flyio).
+If you're unsure, we have a tutorial for using [Fly.io with Backblaze](../deployment/flyio).
 
 ---