feat: Add a handler for nginx

roles/install-sources/handlers/main.yml

@@ -0,0 +1,4 @@
+- name: Reload nginx to apply new configuration
+  ansible.builtin.service:
+    name: nginx
+    state: reloaded

roles/install-sources/tasks/main.yml

@@ -43,3 +43,4 @@
     owner: "{{ fiftyohm_user }}"
     group: "{{ fiftyohm_group }}"
     mode: '0644'
+  notify: Reload nginx to apply new configuration