fix mobile TOC and remove extra scrollbar (#50)

* fix mobile TOC and remove extra scrollbar

* remove extra space when TOC is collapsed
* remove extra scrollbar from content area

* display TOC as static when it needs to be

boostlook.css

@@ -459,7 +459,6 @@ p, h1, h2, h3, h4, h5, h6 {
 
 .boostlook #content {
   padding-top: 1.25rem;
-  overflow-y: auto;
 }
 
 .boostlook #footer {
@@ -552,9 +551,13 @@ p, h1, h2, h3, h4, h5, h6 {
   overflow-y: auto;
 }
 
-.boostlook #toc.toc2 {
+.boostlook #toc.toc2,
+#boost-legacy-docs-wrapper:not(:has(article.doc)) #toc.toc2.is-active {
   position: static;
 }
+#boost-legacy-docs-wrapper:not(:has(article.doc)) #toc.toc2 {
+  position: fixed;
+}
 
 .boostlook #toc.toc2 > ul {
   padding-bottom: 2rem;
@@ -764,6 +767,10 @@ p, h1, h2, h3, h4, h5, h6 {
   position: fixed;
 }
 
+.boostlook #toc.toc2.nav-container.is-active {
+  position: static;
+}
+
 .boostlook #header .nav-container.is-active {
   padding: 1rem;
 }