Use `button_to` instead of `link_to` for post in service settings

app/views/settings/_services.haml

@@ -7,7 +7,7 @@
 
     - APP_CONFIG['sharing'].each do |service, service_options|
       - if service_options['enabled'] && @services.none? { |x| x.provider == service.to_s }
-        %p= link_to t('views.settings.service.connect', service: service.capitalize), "/auth/#{service}", method: :post
+        %p= button_to t('views.settings.service.connect', service: service.capitalize), "/auth/#{service}", method: :post, class: 'btn btn-info'
 
   - if @services.count.positive?
     %ul.list-group
@@ -16,10 +16,12 @@
           %i{ class: "fa fa-#{service.provider}" }
           %strong= service.provider.capitalize
           (#{service.nickname})
-          = link_to t('views.settings.service.disconnect'),
+          = button_to t('views.settings.service.disconnect'),
             service_path(service),
             data: { confirm: t('views.settings.service.confirm', service: service.provider.capitalize) },
-            method: :delete
+            method: :delete,
+            class: 'btn btn-link',
+            form: { class: 'd-inline' }
 
           .col-md-6.mt-2
             = bootstrap_form_for(service, as: 'service', url: update_service_path(service)) do |f|