Added haml-lint and fix warnings (#2773)

* add haml_lint to Gemfile

* add .haml-lint.yml

* fix warnings of haml_lint

app/views/accounts/_grid_card.html.haml

@@ -4,5 +4,5 @@
     .name
       = link_to TagManager.instance.url_for(account) do
         %span.display_name.emojify= display_name(account)
-        %span.username= "@#{account.acct}"
+        %span.username @#{account.acct}
   %p.note.emojify= truncate(strip_tags(account.note), length: 150)

app/views/accounts/_header.html.haml

@@ -1,4 +1,4 @@
-.card.h-card.p-author{ style: "background-image: url(#{account.header.url( :original)})" }
+.card.h-card.p-author{ style: "background-image: url(#{account.header.url(:original)})" }
   - if user_signed_in? && current_account.id != account.id && !current_account.requested?(account)
     .controls
       - if current_account.following?(account)
@@ -13,7 +13,7 @@
   %h1.name
     %span.p-name.emojify= display_name(account)
     %small
-      %span= "@#{account.username}"
+      %span @#{account.username}
       = fa_icon('lock') if account.locked?
   .details
     .bio