Revert "doc: Update git link to mdbook-katex."

This reverts commit 1e8d99d84901e7b5ac27b3034cc463146a7beddf.

.github/workflows/book.yml

@@ -33,7 +33,7 @@ jobs:
                 pip install ghp-import
                 cargo install mdbook
                 export PATH="$HOME/.cargo/bin:$PATH"
-                cargo install --git "https://github.com/heliaxdev/mdbook-katex"
+                cargo install --git "https://github.com/lzanini/mdbook-katex"
                 sudo apt -y install make
 
             - name: Compile and publish the book

doc/README.md

@@ -2,7 +2,7 @@ The DarkFi book
 ===============
 
 This directory contains the sources for the book that can be read on
-<https://darkrenaissance.github.io/darkfi>
+https://darkrenaissance.github.io/darkfi
 
 When adding or removing a section of the book, make sure to update the
 [SUMMARY.md](src/SUMMARY.md) file to actually list the contents.
@@ -10,5 +10,5 @@ When adding or removing a section of the book, make sure to update the
 For the mdbook-katex backend run:
 
 ```
-cargo install --git "https://github.com/heliaxdev/mdbook-katex.git"
+cargo install --git "https://github.com/lzanini/mdbook-katex"
 ```