WUI: niggles in the new Welcome page

[davidsarah]

Here are the presentation niggles I've noticed in the new Welcome page (#1713):

• The red bullet for an unconnected introducer or helper may not indicate clearly enough that it is unconnected. I suggest, since this is an error condition, "Introducer not connected" or "Helper not connected" in large type.
• The nickname and node ID at the top right may not be prominent enough; I didn't notice them at first.
• The left-hand sidebar could be narrower, or alternatively the fields could be extended to use its full width.

These also existed in the previous Welcome page:

• If there is only one storage server, then "Connected to 1 of 1 storage servers" is ungrammatical.
• In the list of package versions, a package and its version can be broken across lines. The list could also be made easier to read by different styles for package and version number.
• 'Create a Directory' is an immediate operation. Should it have the