fix broken image links in stake.mdx

pages/web/stake.mdx

@@ -18,20 +18,32 @@ Once you select a validator to stake with, you can click the `Delegate` button.
 Select how much `UM` you wish to delegate, then press `Delegate`:
 
 <picture>
-  <img src="./images/delegation_amount_example.jpg" />
+  <source
+    srcSet="/images/delegation_amount_example.jpg"
+    media="(prefers-color-scheme: dark)"
+  />
+  <img src="/images/delegation_amount_example.jpg" />
 </picture>
 
 It will take a few moments for the delegation transaction to be prepared, then Prax will generate a view of your
 transaction. Verify one of the outputs is to the validator you selected, then click `Approve`:
 
 <picture>
-  <img src="./images/delegation_prax.jpg" />
+  <source
+    srcSet="/images/delegation_prax.jpg"
+    media="(prefers-color-scheme: dark)"
+  />
+  <img src="/images/delegation_prax.jpg" />
 </picture>
 
 You should see a pop-up in the lower right hand of the page indicating that the transaction was approved!
 
 <picture>
-  <img src="./images/delegation_popup.jpg" />
+  <source
+    srcSet="/images/delegation_popup.jpg"
+    media="(prefers-color-scheme: dark)"
+  />
+  <img src="/images/delegation_popup.jpg" />
 </picture>
 
 You will receive the delegation token associated with that validator. At a later point, you can undelegate by clicking the `Undelegate` button