avoid redirect for matrix calculus HTML

Author: pietroppeter

README.md

@@ -1,6 +1,6 @@
 # Bookish
 
-Bookish is an xml-ish + some markdown format for books and articles that it can convert to HTML and latex. I used it to generate this article: [The Matrix Calculus You Need For Deep Learning](http://parrt.cs.usfca.edu/doc/matrix-calculus/index.html). 
+Bookish is an xml-ish + some markdown format for books and articles that it can convert to HTML and latex. I used it to generate this article: [The Matrix Calculus You Need For Deep Learning](https://explained.ai/matrix-calculus/index.html). 
 
 You can use python directly in the doc like a notebook to compute and print stuff:
 
@@ -122,7 +122,7 @@ Here are the tags that contain attributes, not all of which are required:
 
 [Jeremy Howard](http://www.fast.ai/about/#jeremy) and [I](http://parrt.cs.usfca.edu/) wrote up a nice mathy latex document called ``*The Matrix Calculus You Need For Deep Learning*'' that has over 600 equations. We wanted to post it to the web in HTML or markdown but quickly ran into a problem trying to get equations rendered.
 
-In the end we converted the source document to markdown and build a translator that generated [HTML](http://parrt.cs.usfca.edu/doc/matrix-calculus/index.html) using SVG for equations and [PDF](https://arxiv.org/pdf/1802.01528) from native latex equations. It does a pretty good job with html as you can see:
+In the end we converted the source document to markdown and build a translator that generated [HTML](https://explained.ai/matrix-calculus/index.html) using SVG for equations and [PDF](https://arxiv.org/pdf/1802.01528) from native latex equations. It does a pretty good job with html as you can see:
 
 <table>
 <tr><td>