fixes #3845: add .btn-link for transparent buttons styled as links

docs/assets/css/bootstrap.css

@@ -3175,6 +3175,26 @@ input[type="submit"].btn.btn-mini {
   *padding-bottom: 1px;
 }
 
+.btn-link {
+  color: #0088cc;
+  cursor: pointer;
+  background-color: transparent;
+  background-image: none;
+  border-color: transparent;
+  -webkit-border-radius: 0;
+     -moz-border-radius: 0;
+          border-radius: 0;
+  -webkit-box-shadow: none;
+     -moz-box-shadow: none;
+          box-shadow: none;
+}
+
+.btn-link:hover {
+  color: #005580;
+  text-decoration: underline;
+  background-color: transparent;
+}
+
 .btn-group {
   position: relative;
   *margin-left: .3em;

docs/assets/css/docs.css

@@ -93,7 +93,7 @@ hr.soften {
   padding: 40px 0;
   color: #fff;
   text-align: center;
-  text-shadow: 0 1px 5px rgba(0,0,0,.3), 0 0 30px rgba(0,0,0,.075);
+  text-shadow: 0 1px 3px rgba(0,0,0,.4), 0 0 30px rgba(0,0,0,.075);
   background: #020031; /* Old browsers */
   background: -moz-linear-gradient(45deg,  #020031 0%, #6d3353 100%); /* FF3.6+ */
   background: -webkit-gradient(linear, left bottom, right top, color-stop(0%,#020031), color-stop(100%,#6d3353)); /* Chrome,Safari4+ */
@@ -146,7 +146,7 @@ hr.soften {
   bottom: 0;
   left: 0;
   background: url(../img/bs-docs-masthead-pattern.png) repeat center center;
-  opacity: .5;
+  opacity: .3;
 }
 
 /* Masthead (docs home)