[doc] Add aliases for moved Getting Started pages.

For search engines and so as not to break links people already have,
adds aliases for pages that were moved during a recent refactor of the
project intro pages.

Signed-off-by: Jade Philipoom <jadep@google.com>
diff --git a/doc/getting_started/_index.md b/doc/getting_started/_index.md
index 776115f..1fbee45 100644
--- a/doc/getting_started/_index.md
+++ b/doc/getting_started/_index.md
@@ -1,5 +1,8 @@
 ---
 title: "Getting Started"
+aliases:
+    - /doc/ug/getting_started
+    - /doc/ug/install_instructions
 ---
 
 Welcome!
diff --git a/doc/getting_started/build_sw.md b/doc/getting_started/build_sw.md
index 821ca75..b700e87 100644
--- a/doc/getting_started/build_sw.md
+++ b/doc/getting_started/build_sw.md
@@ -1,5 +1,7 @@
 ---
 title: Building Software
+aliases:
+    - /doc/ug/getting_started_build_sw
 ---
 
 _Before following this guide, make sure you've followed the [dependency installation instructions]({{< relref "getting_started" >}})._
diff --git a/doc/getting_started/setup_dv.md b/doc/getting_started/setup_dv.md
index 3b09d8a..44f2e7e 100644
--- a/doc/getting_started/setup_dv.md
+++ b/doc/getting_started/setup_dv.md
@@ -1,5 +1,7 @@
 ---
 title: "Design Verification Setup"
+aliases:
+    - /doc/ug/getting_started_dv
 ---
 
 _Before following this guide, make sure you've followed the [dependency installation and software build instructions]({{< relref "getting_started" >}})._
diff --git a/doc/getting_started/setup_formal.md b/doc/getting_started/setup_formal.md
index 5f401e0..a8fbd90 100644
--- a/doc/getting_started/setup_formal.md
+++ b/doc/getting_started/setup_formal.md
@@ -1,5 +1,7 @@
 ---
 title: "Formal Verification Setup"
+aliases:
+    - /doc/ug/getting_started_formal
 ---
 
 _Before following this guide, make sure you've followed the [dependency installation and software build instructions]({{< relref "getting_started" >}})._
diff --git a/doc/getting_started/setup_fpga.md b/doc/getting_started/setup_fpga.md
index 1f4f3c1..c1ce852 100644
--- a/doc/getting_started/setup_fpga.md
+++ b/doc/getting_started/setup_fpga.md
@@ -1,5 +1,7 @@
 ---
 title: "FPGA Setup"
+aliases:
+    - /doc/ug/getting_started_fpga
 ---
 
 _Before following this guide, make sure you've followed the [dependency installation and software build instructions]({{< relref "getting_started" >}})._
diff --git a/doc/getting_started/setup_verilator.md b/doc/getting_started/setup_verilator.md
index 7125c03..95f20d6 100644
--- a/doc/getting_started/setup_verilator.md
+++ b/doc/getting_started/setup_verilator.md
@@ -1,5 +1,7 @@
 ---
 title: Verilator Setup
+aliases:
+    - /doc/ug/getting_started_verilator
 ---
 
 _Before following this guide, make sure you've followed the [dependency installation and software build instructions]({{< relref "getting_started" >}})._