git: add local branding to gitweb

roles/git/server/files/gitweb-local.css

@@ -0,0 +1,24 @@
+
+body {
+  margin: 0px;
+}
+
+img.logo {
+  height: 50px;
+  width: 172px;
+  float: left;
+  margin-right: 50px;
+}
+
+div.page_header {
+  background: #000;
+  height: 50px;
+  padding-top: 15px;
+  padding-left: 0px;
+  padding-bottom: 0px;
+  color: #fff;
+}
+
+div.page_header a:visited {
+  color: #fff;
+}