[VOL-2875] Documentation update

- Updated the main landing page and overview documentation
- Added the lab setup (copied from CORD docs)
- Use forked sphinx-multiversion to publish docs, which allows versions
  to be listed at bottom of sidebar
- Updated logo and favicon, fixed CSS to make logo legible
- Use VERSION file to set the version in the sidebar
- Add more words to dictionary
- removed reload functionality that is nonworking in Sphinx 2.x
- Fixed lint/linkcheck issues

Change-Id: I032e67d76393778fc697944a6d5df9c8cdacbbc4
diff --git a/dict.txt b/dict.txt
index c4e3a6d..09e8bed 100644
--- a/dict.txt
+++ b/dict.txt
@@ -1,3 +1,4 @@
+Accton
 Apps
 Autocomplete
 Broadcom
@@ -18,6 +19,7 @@
 Quickstart
 README
 Sadis
+SemVer
 Ubuntu
 Username
 Voltha
@@ -35,6 +37,8 @@
 bbsim
 bbsimctl
 config
+crc
+cmake
 dep
 dhcp
 dhcpl
@@ -42,6 +46,7 @@
 eap
 eapol
 etcd
+etcdctl
 filesystem
 gRPC
 gerrit
@@ -49,17 +54,28 @@
 golang
 gz
 https
+igmp
+igmpproxy
 internet
+intf
 io
+jq
 kafka
+kafkaAddress
+kafkacat
+onuAlarms
 kubernetes
+kubectl
+libpcap
 lifecycle
 localhost
 lossofomcichannel
 lossofploam
 macports
+mcast
 md
 microservices
+netcfg
 ofagent
 olt
 online
@@ -79,17 +95,20 @@
 protobufs
 protoc
 protos
+pyvoltha
 quickstart
 reStructuredText
 repo
 repos
 rst
 rw
+rx
 sadis
 signaldegrade
 src
 symlink
 toolset
+tx
 vendored
 virtualenv
 virtualized