Update theme.yml

more docs re: home page

Author: dcnb

_data/theme.yml

@@ -1,5 +1,6 @@
 ##################################################
 ########## ORAL HISTORY as Data OPTIONS ##########
+######## (collecitonbuilder options below) #######
 ##################################################
 
 ##########
@@ -38,19 +39,21 @@ base-layout: OHD # OHD or CB
 ##########
 # HOME PAGE
 # The optional visualization on the home page is a composite of the transcripts color-coded representation 
-# To turn it off, either don't include a filters.
+# To turn it off, either don't include a filters or change the value below to false.
 home-page-visualization: true # true / false, if true, the visualization will appear on the home page
-# This will determine the height of the visualization on the home page
-home-page-visualization-size: 30%
+# if false or there's no _data/filters.csv, the image defined by featured-image will be used as a featured image on the homepage
+
 # featured image is used in home page banner and in meta markup to represent the collection
 # use either an objectid (from an item in this collect), a relative location of an image in this repo, or a full url to an image elsewhere. 
 # Note: if you are using the CB base layout as determined above, the featured image defined here will show up as the large image at top of the home page
 featured-image: gluck
-# optional: add extra padding around collection title for a larger image feature. 
+# optional for CB base layout: add extra padding around collection title for a larger image feature. 
 home-title-y-padding: 12em # the margin from the top your title portion will appear.
 # optional: change position of background image, center, top, bottom
 home-banner-image-position: center # Default is top
 
+########## Typical CollectionBuilder options ########
+
 ##########
 # ITEM PAGE
 #