Move OPML import

[erlend-sh]

This will be a two-part job. The first part is the most urgent, which is to remote the ‘OPML import’ button from here:

This is an awesome feature and we have plans for it, but it’s misplaced on this page. We just threw it in anywhere to begin with to confirm that it works.

• Remove OMPL button
• Add OMPL button in more complementary context (see Special Pages)