docs: change sphinx HTML theme to furo

Change-Id: Ia51285eadc19beeb051ce102502544e85442cb9c
diff --git a/docs/doxygen.conf.in b/docs/doxygen.conf.in
index d1c5a07..dbf27ba 100644
--- a/docs/doxygen.conf.in
+++ b/docs/doxygen.conf.in
@@ -32,7 +32,7 @@
 # title of most generated pages and in a few other places.
 # The default value is: My Project.
 
-PROJECT_NAME           = "ndn-cxx: NDN C++ library with eXperimental eXtensions"
+PROJECT_NAME           = "ndn-cxx: NDN C++ Library"
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number. This
 # could be handy for archiving the generated documentation or if some version