Forums: Duplicate "login into create topic" links

[dufresnesteven]

When a user is viewing a forum logged out, we have a button at the top of the page to create a topic that reads "Log in to Create a Topic" (See: https://meta.trac.wordpress.org/ticket/3934).

Additionally below the support forum table we have a banner that reads "You must be logged in to create topics". This banner looks like a warning and is unexpected to new users.

I'm assuming this was added because people who use the forum get confused as to why they can't see the create new topic form.

Can we remove the bottom banner if the user is not logged in? If we are concerned about the visibility of creating a topic, we could increase the "Log in to Create Topic" button's prominence by updating it's style to match wp.org's primary button styles (Blue).

Additionally, we should add #new-post to the login redirect url to make sure users are presented the form after log in as opposed to being dropped at the top of the page, which is how it currently works.

[coffee2code]

In 13395:

Support: Don't display notice at bottom of forum if user is not logged in.

The page already states near the top that logging in is required to create a topic.

Props dufresnesteven, coffee2code.
Fixes #7445.