update links on PDC Describe to static page (#1916)

Co-authored-by: Robert-Anthony Lee-Faison <[email protected]>

app/views/welcome/index.html.erb

@@ -51,8 +51,8 @@
       <li><span class="strong">Verify your agreement with the Princeton Data Commons Describe policies and guidelines</span>
         <ul class="homepage-bullet-points">
           <li>Review the PDC policies for 
-            <a href="https://drive.google.com/file/d/1GECvKoOjwqvKTKYvyNThCyzTWjD6cPxs/view?usp=sharing">Acceptance and Retention</a>
-            and <a href="https://drive.google.com/file/d/1E8EgfyL2yB2rH0xCIIqYrTFE0QfY8Sk_/view?usp=sharing">Distribution</a>: 
+            <a href="https://datacommons.princeton.edu/discovery/policies">Acceptance and Retention</a>
+            and <a href="https://datacommons.princeton.edu/discovery/policies">Distribution</a>: 
             Be sure your intended submission is 
             eligible for PDC, that you are authorized to grant permission for redistribution, and that you are prepared 
             to pay any applicable costs. If you are unsure about any of these points, please <span style="color: #0062ad">contact PRDS</span>