ansible: fix main playbook syntax for consistency

dotfiles.yml

@@ -1,22 +1,23 @@
-- name: Set up development machine
+- name: Make myself at home :)
   hosts: dotfiles
   vars_prompt:
-      - name: git_user
-        private: no
-        default: Fernando Schauenburg
-      - name: git_email
-        private: no
-        default: fernando@schauenburg.me
+  - name: git_user
+    private: no
+    default: Fernando Schauenburg
+  - name: git_email
+    private: no
+    default: fernando@schauenburg.me
   roles:
-    - packages
-    - bin
-    - bash
-    - dircolors
-    - git
-    - hushlogin
-    - mintty
-    - python
-    - readline
-    - ssh
-    - tmux
-    - vim
+  - packages
+  - bin
+  - bash
+  - dircolors
+  - git
+  - hushlogin
+  - mintty
+  - python
+  - readline
+  - ssh
+  - tmux
+  - vim
+