Part 2 of the updates in response to the SWPC site upgrade

This is a follow-on to PR #22 so that the Replan Central content and links are correct following the SWPC site upgrade.  In PR #22 some legacy links were used as a quick workaround.

This PR also adds a link to the ACE solar wind plot and puts a box around all of the images for style purposes.

The full diffs from the previous FD-approved version (i.e. including PR #22) are:
  https://github.com/sot/arc/compare/435a5d1...swpc-final