ci: replace Travis with GitHub Actions

Sync docs/conf.py with ndn-cxx

Change-Id: I2c7106ef52a0e7c00de6767c6b59dbd3ce1dc082
diff --git a/docs/index.rst b/docs/index.rst
index 872ace5..bdd22a2 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -8,15 +8,12 @@
    DesignDoc
 
 * :doc:`DesignDoc`
-
-**Additional documentation**
-
 * `API documentation (doxygen) <doxygen/annotated.html>`_
 
 Downloading
 -----------
 
-* `Source code GitHub git repository <https://github.com/named-data/ChronoSync>`_.
+* `Source code git repository <https://github.com/named-data/ChronoSync>`_
 
 License
 -------