ELIXIR banner: Document options for white background, CDR logo

content/websites/patterns/banner-elixir/banner-elixir.html

-<div id="elixir-banner" data-color="grey" data-name="This service" data-description="I am a super cool service" data-use-basic-styles="true"></div>
+<div id="elixir-banner" data-color="grey" data-name="This service" data-description="I am a super cool service" data-use-basic-styles="true" data-use-cdr-logo="false"></div>
 
 <!-- <script defer="defer" src="./banner-elixir/banner-elixir.js"></script> -->
 <script defer="defer" src="https://ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.3/js/elixirBanner.js"></script>

content/websites/patterns/banner-elixir/layout.html

@@ -28,10 +28,11 @@ body {
 <script defer="defer" src="https://ebi.emblstatic.net/web_guidelines/EBI-Framework/v1.3/js/elixirBanner.js"></script>
 ```
 
-There are optional `data` attributes:
+Optional `data` attributes:
 
-- `data-color`: set the background color; options: orange, grey, blue, green
+- `data-color`: set the background color; options: orange, grey, blue, green, none (black text on white)
 - `data-name`: set part of the tite (data-name + "is part of the ELIXIR infrastructure")
+- `data-use-cdr-logo`: use the ELIXIR CDR logo instead of the [kitemark](https://www.ebi.ac.uk/web_guidelines/EBI-Framework/v1.2/images/logos/assorted/elixir_kitemark-60px.png)
 - `data-description`: set the text in the small line of text
 - `data-more-information-link`: by default the banner will point to a page at www.elixir-europe.org. If you would prefer to link to a custom page explaining your relationship with ELXIR, add the full URL here
 - `data-use-basic-styles`: if you have not loaded the Foundation Framework CSS, set to `true` and will inject a few lines of css for basic formatting