gitweb: Support for simple project search form

This is a trivial patch adding support for searching projects by name
and description, making use of the "infrastructure" provided by the
tag cloud generation.

Signed-off-by: Petr Baudis <petr.baudis@novartis.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

gitweb/gitweb.css

@@ -435,6 +435,10 @@ div.search {
 	right: 12px
 }
 
+p.projsearch {
+	text-align: center;
+}
+
 td.linenr {
 	text-align: right;
 }