(DOCSP-11409): Remove How-To Guidelines page (#46)

Author: melissamahoney-mongodb

source/style-guide.txt

@@ -69,7 +69,6 @@ MongoDB external and internal customers.
       /style-guide/markup-guidelines
       /style-guide/terminology/index
       /style-guide/screenshots/index
-      /style-guide/how-to-article-guidelines
       /style-guide/error-message-guidelines
       /style-guide/release-notes-guidelines
       /style-guide/revision-history