Update the design for the right sidebar on content creation page

Problem/Motivation

The right sidebar on the node creation page looks bad, due to the border and the default browser outline effect. I suggest we improve the theming to make the sidebar look better. Currently the 'sidebar' looks like this:

node/add/article:
-

Proposed resolution

I suggest we fix the border issues and the outline. Currently I've created a patch that makes the sidebar looks like this:

node/add/article:
-

Remaining tasks

• Finalize and agree on the visual design
• Write the patch

User interface changes

Updated look for the right sidebar for content

API changes

None.