Merge branch 'mobile_menu_scss' into 'master'

Adjusted scss for sidebar mobile menu to prevent rendering problems Fixes #72

Closes #72

See merge request soapbox-pub/soapbox-fe!17

app/styles/gabsocial/components/sidebar-menu.scss

@@ -1,11 +1,10 @@
 .sidebar-menu {
   display: flex;
-  position: fixed;
+  position: absolute;
   flex-direction: column;
   width: 275px;
-  height: 100vh;
+  height: auto;
   top: 0;
-  bottom: 0;
   left: 0;
   background-color: #fff;
   transform: translateX(-275px);