Set of small UI fixes to project and profile pages

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/profiles/applications.html.haml

 - page_title "Applications"
 - header_title page_title, applications_profile_path
 
-.gray-content-block.top-block
+.alert.alert-help.prepend-top-default
   - if user_oauth_applications?
     Manage applications that can use GitLab as an OAuth provider,
     and applications that you've authorized to use your account.

app/views/profiles/audit_log.html.haml

 - page_title "Audit Log"
 - header_title page_title, audit_log_profile_path
 
-.gray-content-block.top-block
+.alert.alert-help.prepend-top-default
   History of authentications
 
 .prepend-top-default

app/views/profiles/emails/index.html.haml

 - page_title "Emails"
 - header_title page_title, profile_emails_path
 
-.gray-content-block.top-block
-  Control emails linked to your account
-
-%ul.prepend-top-default
+.alert.alert-help.prepend-top-default
+  %ul
     %li
       Your
       %b Primary Email

app/views/profiles/keys/index.html.haml

 - page_title "SSH Keys"
 - header_title page_title, profile_keys_path
 
-.gray-content-block.top-block
-  .pull-right
+.top-area
+  .nav-text
+    Before you can add an SSH key you need to
+    = link_to "generate it.", help_page_path("ssh", "README")
+  .nav-controls
     = link_to new_profile_key_path, class: "btn btn-new" do
       = icon('plus')
       Add SSH Key
-  .oneline
-    Before you can add an SSH key you need to
-    = link_to "generate it.", help_page_path("ssh", "README")
 
 .prepend-top-default
 = render 'key_table'

app/views/profiles/notifications/show.html.haml

 - page_title "Notifications"
 - header_title page_title, profile_notifications_path
 
-.gray-content-block.top-block
-  These are your global notification settings.
-
 .prepend-top-default
 = form_for @user, url: profile_notifications_path, method: :put, html: { class: 'update-notifications form-horizontal global-notifications-form' } do |f|
   -if @user.errors.any?

app/views/profiles/passwords/edit.html.haml

 - page_title "Password"
 - header_title page_title, edit_profile_password_path
 
-.gray-content-block.top-block
+.alert.alert-help.prepend-top-default
   - if @user.password_automatically_set?
     Set your password.
   - else

app/views/profiles/preferences/show.html.haml

 - page_title 'Preferences'
 - header_title page_title, profile_preferences_path
-- @blank_container = true
 
-.alert.alert-help
+.alert.alert-help.prepend-top-default
   These settings allow you to customize the appearance and behavior of the site.
   They are saved with your account and will persist to any device you use to
   access the site.

app/views/profiles/show.html.haml

-.gray-content-block.top-block
+.alert.alert-help.prepend-top-default
   This information will appear on your profile.
   - if current_user.ldap_user?
     Some options are unavailable for LDAP accounts

app/views/projects/edit.html.haml

-- @blank_container = true
-
 .project-edit-container.prepend-top-default
   .project-edit-errors
   .project-edit-content