Add first draft of DIY kit build guide.

Author: theacodes

user_guide/docs/css/overrides.css

@@ -10,4 +10,16 @@ ul.nav li.first-level {
 
 footer small:last-child {
     display: none;
+}
+
+img[align=left] {
+    width: 50%;
+}
+img[align=right] {
+    width: 50%;
+}
+
+div[role=main] img {
+    margin-top: 1rem;
+    margin-bottom: 1rem;
 }