Do not print the comments form (#1195)

Add `.page__comments-form` to "non-printing" selectors in print styles

_includes/comments.html

@@ -47,6 +47,7 @@
             <!-- End static comments -->
 
             <!-- Start new comment form -->
+            <div class="page__comments-form">
               <h4 class="page__comments-title">{{ site.data.ui-text[site.locale].comments_label | default: "Leave a Comment" }}</h4>
               <p class="small">{{ site.data.ui-text[site.locale].comment_form_info | default: "Your email address will not be published. Required fields are marked" }} <span class="required">*</span></p>
               <form id="new_comment" class="page__comments-form js-form form" method="post" action="https://api.staticman.net/v1/entry/{{ site.repository }}/{{ site.staticman.branch }}">
@@ -86,6 +87,7 @@
                   <button type="submit" id="comment-form-submit" tabindex="5" class="btn btn--large">{{ site.data.ui-text[site.locale].comment_btn_submit | default: "Submit Comment" }}</button>
                 </fieldset>
               </form>
+            </div>
             <!-- End new comment form -->
           {% endif %}
         </section>

_sass/minimal-mistakes/_print.scss

@@ -228,6 +228,7 @@
   .pagination,
   .ads,
   .page__footer,
+  .page__comments-form,
   .author__avatar,
   .author__content,
   .author__urls-wrapper,