[VOL-5545] Update voltha docs

- release notes for VOLTHA versions 2.6 to 2.15 with new Jira links and adjust release schedule details
- update old links
- remove ONF references and links
- update e-mail links
- update copright notices

Change-Id: Id6be18986a8f52f2dfcc07e2b0d2efcb0ae1c0e4
Signed-off-by: serkant.uluderya <serkant.uluderya@netsia.com>
diff --git a/index.rst b/index.rst
index b7e461f..5990759 100644
--- a/index.rst
+++ b/index.rst
@@ -2,7 +2,7 @@
 ====================
 
 `VOLTHA (Virtual OLT Hardware Abstraction
-<https://www.opennetworking.org/voltha/>`_ is an open source project to create a
+<https://lfbroadband.org/projects/voltha/>`_ is an open source project to create a
 hardware abstraction for broadband access equipment. It supports the principle
 of multi-vendor, disaggregated, "any broadband access as a service" for the
 Telco Central Office.
@@ -23,9 +23,7 @@
 - **Cloud/DevOps bridge to modernization**: it does all above while using a
   microservices architecture running on top of Docker and/or Kubernetes.
 
-VOLTHA is a sub-project of the `Open Networking Foundation's
-<https://www.opennetworking.org>`_ `CORD project
-<https://www.opennetworking.org/cord/>`_.
+VOLTHA is a project under the `Linux Foundation Broadband <https://lfbroadband.org>`.
 
 .. figure:: ./_static/voltha_diagram.svg
    :alt: VOLTHA Component Diagram