[closes #70] added TDS info to install docs

Author: nickwesselman

docs/assets/css/app.scss

@@ -24,4 +24,8 @@ a.navbar-item.is-active {
 .navbar-dropdown a.navbar-item.is-active {
     color: #000 !important;
     text-decoration: underline;
+}
+
+.content ul {
+    margin-top: unset;
 }

docs/install.md

@@ -12,6 +12,8 @@ instance.
     * SQL Server 2016 SP2 or 2017
     * Apache Solr 7.5.0 with SSL enabled
     * .NET Framework 4.7.2
+1. To install TDS-based examples, you'll need to [install Sitecore TDS v6.0.0.8](https://www.teamdevelopmentforsitecore.com/Download/TDS-Classic) or higher.
+    * If you do not have a license for Sitecore TDS, you can [obtain a trial license](https://www.teamdevelopmentforsitecore.com/TDS-Classic/Free-Trial).
 1. [Clone the full repository](https://github.com/Sitecore/Helix.Examples) or [download it](https://github.com/Sitecore/Helix.Examples/archive/master.zip) and unzip into a local directory.
 1. Download the on-premises XP Single (XP0) packages from
 [dev.sitecore.net](https://dev.sitecore.net/Downloads/Sitecore_Experience_Platform/92/Sitecore_Experience_Platform_92_Initial_Release.aspx) and, without unzipping, place the package into the `install-assets` folder of the repository.