refactor: Let's Encrypt location block

Removed the 'blockinfile' task and added the
location block for Let's Encrypt in the Nginx
config template. This bloc will be rendered if
Let's encrypt support is enabled.

Part of dananglin/pleroma-ansible-playbook#1

roles/pleroma-nginx/tasks/main.yml

@@ -87,24 +87,6 @@
     type: RSA
   when: pleroma.ssl.letsEncrypt.enable
 
-- name: Nginx -- Ensuring the location block for the ACME challenge is configured.
-  blockinfile:
-    path: "{{ pleroma_nginx_conf_file }}"
-    state: present
-    mode: '0600'
-    owner: root
-    group: root
-    insertafter: '^\s+#\s\[\[PLACEHOLDER\sFOR\sLETS\sENCRYPT\sFOLDER\]\].*$'
-    block: |2
-          location ~/\.well-known/acme-challenge {
-            root {{ pleroma_letsEncrypt_baseDir }}/;
-            try_files $uri @forward_https;
-          }
-          location @forward_https {
-            return         301 https://$server_name$request_uri;
-          }
-  when: pleroma.ssl.letsEncrypt.enable
-
 - name: Nginx -- Checking if the full chain certificate exists.
   stat:
     path: "{{ pleroma_ssl_fullChainCert }}"

roles/pleroma-nginx/templates/etc_ngnix_confd_pleroma.conf.j2

@@ -7,7 +7,15 @@ server {
     listen         80;
     listen         [::]:80;
 
-    # [[PLACEHOLDER FOR LETS ENCRYPT FOLDER]]
+    {% if pleroma.ssl.letsEncrypt.enable == true -%}
+    location ~/\.well-known/acme-challenge {
+      root {{ pleroma_letsEncrypt_baseDir }}/;
+      try_files $uri @forward_https;
+    }
+    location @forward_https {
+      return         301 https://$server_name$request_uri;
+    }
+    {% endif %}
 
     location / {
       return         301 https://$server_name$request_uri;