Added kafka and springBoot roles, minor cleanup, and use ansible-vault to hide sensitive data

ansible/applications.yaml

@@ -1,6 +1,20 @@
 ---
+- name: Create server
+  hosts: setup
+  gather_facts: false
+  roles:
+    - server_setup
 - name: Set up domain
   hosts: frontend
+  gather_facts: false
   remote_user: "{{ ssh_user }}"
   roles:
     - frontend
+- name: Set up Spring Boot applications
+  hosts: springBoot
+  gather_facts: false
+  become: true
+  become_method: ansible.builtin.sudo
+  remote_user: "{{ ssh_user }}"
+  roles:
+    - spring_boot