xmlui: Add ICARDA XMLUI theme

Initial work done by Sisay Webshet (@swebsheet).

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Update ICARDA theme with new DSpace 4.2 Mirage assets

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Adjust space for item list in ICARDA theme

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Normalize fonts in ICARDA

11px is a bit too small, let's normalize 12px for all body text for
now.

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Update ICARDA theme with new DSpace 4.2 Mirage assets

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Rename ICARDA banner to banner.jpg

No need to have it be icarda.jpg, it's obvious it's for icarda.

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Remove garbage from ICARDA stylesheet

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Clean up more garbage in ICARDA style

Signed-off-by: Alan Orth <a.orth@cgiar.org>
xmlui: Tweak ICARDA theme to reflect icarda.org

Update text, link, headers, borders, etc to use a bit more style
from icarda.org.

Signed-off-by: Alan Orth <a.orth@cgiar.org>