README: simplify HTML5 UP Photon credit

No need to embed a big code block -- just link to it.

Author: ctrueden

README.md

@@ -15,39 +15,7 @@ interface, but it is more powerful, with a much faster edit-debug cycle.
 
 ## Credit
 
-The site theme was adapted from Photon by HTML5 UP:
-
-```
-Photon by HTML5 UP
-html5up.net | @ajlkn
-Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-
-A simple (gradient-heavy) single pager that revisits a style I messed with on two
-previous designs (Tessellate and Telephasic). Fully responsive, built on Sass,
-and, as usual, loaded with an assortment of pre-styled elements. Have fun! :)
-
-Demo images* courtesy of Unsplash, a radtastic collection of CC0 (public domain) images
-you can use for pretty much whatever.
-
-(* = Not included)
-
-Feedback, bug reports, and comments are not only welcome, but strongly encouraged :)
-
-AJ
-[email protected] | @ajlkn
-
-Credits:
-
-  Demo Images:
-    Unsplash (unsplash.com)
-
-  Icons:
-    Font Awesome (fontawesome.io)
-
-  Other:
-    jQuery (jquery.com)
-    Responsive Tools (github.com/ajlkn/responsive-tools)
-```
+The site theme evolved from [Photon by HTML5 UP](https://html5up.net/photon).
 
 The site makes use of many amazing web libraries and tools, including: