gitweb: Put project README in div.readme, fix its padding

Put (optional) projects README on "summary" page in <div> element
using "readme" class.  This allow to style it using CSS.

Add padding to project's README to make it line out with the rest
of the page.
Signed-off-by: NJakub Narebski <jnareb@gmail.com>

gitweb/gitweb.css

@@ -85,6 +85,10 @@ div.title, a.title {
 	color: #000000;
 }
 
+div.readme {
+	padding: 8px;
+}
+
 a.title:hover {
 	background-color: #d9d8d1;
 }

gitweb/gitweb.perl

@@ -3912,8 +3912,10 @@ sub git_summary {
 
 	if (-s "$projectroot/$project/README.html") {
 		if (open my $fd, "$projectroot/$project/README.html") {
-			print "<div class=\"title\">readme</div>\n";
+			print "<div class=\"title\">readme</div>\n" .
+			      "<div class=\"readme\">\n";
 			print $_ while (<$fd>);
+			print "\n</div>\n"; # class="readme"
 			close $fd;
 		}
 	}