Remove some broken links to the old AsterixDB site.

Change-Id: I54e42c3ecca6e4b002dec1f4922b7255b5a49593
Reviewed-on: https://asterix-gerrit.ics.uci.edu/1499
Reviewed-by: Yingyi Bu <buyingyi@gmail.com>
Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterixdb/asterix-doc/src/site/markdown/install.md b/asterixdb/asterix-doc/src/site/markdown/install.md
index 888d4d3..fd86023 100644
--- a/asterixdb/asterix-doc/src/site/markdown/install.md
+++ b/asterixdb/asterix-doc/src/site/markdown/install.md
@@ -195,7 +195,7 @@
     Connection to 127.0.0.1 closed.
 
 ### Configuring Managix ###
-You will need the AsterixDB installer (a.k.a. Managix). Download Managix from [here](http://asterixdb.ics.uci.edu/download.html); this includes the bits for Managix as well as AsterixDB.
+You will need the AsterixDB installer (a.k.a. Managix). Download the Standalone Cluster installer from [here](https://asterixdb.apache.org/download.html); this includes the bits for Managix as well as AsterixDB.
 
 To be able to create an AsterixDB instance and manage its lifecycle, the Managix requires you to configure a set of configuration files namely:
 
@@ -445,7 +445,7 @@
 
 ### Step (2): Define the AsterixDB cluster ###
 
-We first log into the master machine as the user "joe". On this machine, download Managix from [here](http://asterixdb.ics.uci.edu/download.html) (save as above), then do the following steps similar to the single-machine case described above:
+We first log into the master machine as the user "joe". On this machine, download the Standalone Cluster installer from [here](https://asterixdb.apache.org/download.html) (save as above), then do the following steps similar to the single-machine case described above:
 
     machineA> cd ~
     machineA> mkdir asterix-mgmt
diff --git a/asterixdb/asterix-doc/src/site/markdown/overview.md b/asterixdb/asterix-doc/src/site/markdown/overview.md
index edf98bb..d0f2e73 100644
--- a/asterixdb/asterix-doc/src/site/markdown/overview.md
+++ b/asterixdb/asterix-doc/src/site/markdown/overview.md
@@ -44,7 +44,7 @@
 
 1. [Installing AsterixDB using Managix](install.html) :
 This is our installation guide, and it is where you should start.
-This document will tell you how to obtain, install, and manage instances of [AsterixDB](http://asterixdb.ics.uci.edu/download.html), including both single-machine setup (for developers) as well as cluster installations (for deployment in its intended form).
+This document will tell you how to obtain, install, and manage instances of [AsterixDB](https://asterixdb.apache.org/download.html), including both single-machine setup (for developers) as well as cluster installations (for deployment in its intended form).
 
 2. [AsterixDB 101: An ADM and AQL Primer](aql/primer.html) :
 This is a first-timers introduction to the user model of the AsterixDB BDMS, by which we mean the view of AsterixDB as seen from the perspective of an "average user" or Big Data application developer.
diff --git a/asterixdb/asterix-doc/src/site/markdown/yarn.md b/asterixdb/asterix-doc/src/site/markdown/yarn.md
index 84bea89..787a4c8 100644
--- a/asterixdb/asterix-doc/src/site/markdown/yarn.md
+++ b/asterixdb/asterix-doc/src/site/markdown/yarn.md
@@ -70,7 +70,7 @@
         Bringing machine 'cc' up with 'virtualbox' provider...
         ...
 
-Once vagrant returns, the environment will be ready. The working directory with the Vagrantfile is also visible to each of the virtual machines (in the /vagrant directory), so we will unzip the Asterix binaries here as well for easy access. The YARN binary can be found on the AsterixDB [downloads page](http://asterixdb.ics.uci.edu/download.html)
+Once vagrant returns, the environment will be ready. The working directory with the Vagrantfile is also visible to each of the virtual machines (in the /vagrant directory), so we will unzip the Asterix binaries here as well for easy access. The YARN binary can be found on the AsterixDB [downloads page](https://asterixdb.apache.org/download.html)
 
     ↪ unzip -d asterix-yarn/ asterix-yarn-binary-assembly.zip
     ...