Ignore __cache directory

Author: giordano

.gitignore

@@ -20,9 +20,5 @@ deps/src/
 docs/build/
 docs/site/
 
-# File generated by Pkg, the package manager, based on a corresponding Project.toml
-# It records a fixed state of all packages used by the project. As such, it should not be
-# committed for packages, but should be committed for applications that require a static
-# environment.
-# Manifest.toml
-__site
+__site/
+__cache/