Fix alignment of global navigation

Our theme uses a left margin on the list items in the global navigation,
causing the navigation to not be center-aligned. This commit removes the
left margin on the first list item, allowing it to be horizontally
centered.

Change-Id: Ib368457584e8d798a99e5fec89e4bbecea68bcd5
Reviewed-on: https://gerrit.causes.com/23658
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Improve page titles

On the homepage, the title was prefixed with a stray "|" character
because the theme assumed that there would always be a site subtitle but
we do not use this option. This commit removes that unsightly character.

At the same time, I changed the "|" for the interpunct (middot)
character.

Change-Id: I3d36a538ef390f09621dd376172f6f9b7996d396
Reviewed-on: https://gerrit.causes.com/23659
Tested-by: Joe Lencioni <joe.lencioni@causes.com>
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Greg Hurrell <greg@causes.com>