Update landing page URLs

Author: NT7S

_data/sidebars/crx1_sidebar.yml

@@ -24,7 +24,7 @@ entries:
     output: web, pdf
     folderitems:
     - title: CRX1 Home
-      url: /crx1_landing_page
+      url: /crx1
       output: web
 
     - title: CRX1 Description and Specifications

_data/sidebars/empyrean_sidebar.yml

@@ -24,7 +24,7 @@ entries:
     output: web, pdf
     folderitems:
     - title: Empyrean Home
-      url: /empyrean_landing_page
+      url: /empyrean
       output: web
 
     - title: Empyrean Description and Specifications

_data/sidebars/etherprog_sidebar.yml

@@ -24,7 +24,7 @@ entries:
     output: web, pdf
     folderitems:
     - title: EtherProg Home
-      url: /etherprog_landing_page
+      url: /etherprog
       output: web
 
     - title: EtherProg Description and Specifications

_data/sidebars/openbeacon_sidebar.yml

@@ -24,7 +24,7 @@ entries:
     output: web, pdf
     folderitems:
     - title: OpenBeacon Home
-      url: /openbeacon_landing_page
+      url: /openbeacon
       output: web
 
     - title: OpenBeacon Description and Specifications

_data/sidebars/si5351abb_sidebar.yml

@@ -24,7 +24,7 @@ entries:
     output: web, pdf
     folderitems:
     - title: Si5351A Breakout Board Home
-      url: /si5351abb_landing_page
+      url: /si5351abb
       output: web
 
     - title: Si5351A Breakout Board Description and Specifications