Remove utilities from docs

These utils are deprecated anyway, we are no longer using dynamic leading, and typeface tester has issues because of privacy.

Author: JayPanoz

docs/index.md

@@ -17,11 +17,4 @@ Readium CSS provides styles for reflowable text:
 
 ## Download
 
-[You can alternatively download this documentation as an EPUB file](https://github.com/readium/css/raw/master/docs/ReadiumCSS_docs.epub).
-
-## Utilities
-
-We’ve been using house-made web apps during ReadiumCSS that we made available in the project’s repo:
-
-- [Typeface Tester](utils/Typeface-tester.html), to help pick fonts for reading apps or alternatives for EPUB files;
-- [Dynamic Leading Tester](utils/DynamicLeading-tester.html), to find the ideal line-height for a specified font.
+[You can alternatively download this documentation as an EPUB file](https://github.com/readium/css/raw/master/docs/ReadiumCSS_docs.epub).