Add dark-mode support (#24)

* add dark-mode support

* make improvements as suggested by riggraz

* fix some dark theme styles

Co-authored-by: Riccardo Graziosi <riccardo.graziosi97@gmail.com>

app/javascript/components/Board/NewPost.tsx

@@ -156,7 +156,7 @@ class NewPost extends React.Component<Props, State> {
               { showForm ? 'Cancel' : 'Submit feedback' }
             </Button>
           :
-            <a href="/users/sign_in" className="btn btn-dark">
+            <a href="/users/sign_in" className="btn">
               Log in / Sign up
             </a>
         }

app/javascript/components/Comments/Comment.tsx

@@ -68,10 +68,11 @@ const Comment = ({
               { 'Post update: ' + (isPostUpdate ? 'yes' : 'no') }
             </a>
             <Separator />
-            <a href={`/admin/comments/${id}/edit`} data-turbolinks="false">Edit</a>
+            <a href={`/admin/comments/${id}/edit`} className="commentLink" data-turbolinks="false">Edit</a>
             <Separator />
             <a
               href={`/admin/comments/${id}`}
+              className="commentLink"
               data-method="delete"
               data-confirm="Are you sure?"
               data-turbolinks="false">Delete</a>