Update Ed25519 issues to reference w3c/webcrypto repo

The WICG/webcrypto-secure-curves repo has been archived and the issues
have been copied over.

Author: twiss

spec/Overview.html

@@ -10386,16 +10386,11 @@ <h5>Sign</h5>
                   Section 5.1.6, with |message| as |M|,
                   using the Ed25519 private key associated with |key|.
                 </p>
-                <div class="issue">
-                  <p>
-                    Some implementations may (wish to) generate randomized signatures
-                    as per <a href="https://datatracker.ietf.org/doc/draft-irtf-cfrg-det-sigs-with-noise/">draft-irtf-cfrg-det-sigs-with-noise</a>
-                    instead of deterministic signatures as per [[RFC8032]].
-                  </p>
-                  <p>
-                    See <a href="https://github.com/WICG/webcrypto-secure-curves/issues/28">WICG/webcrypto-secure-curves issue 28</a>.
-                  </p>
-                </div>
+                <p class="issue" data-number="424">
+                  Some implementations may (wish to) generate randomized signatures
+                  as per <a href="https://datatracker.ietf.org/doc/draft-irtf-cfrg-det-sigs-with-noise/">draft-irtf-cfrg-det-sigs-with-noise</a>
+                  instead of deterministic signatures as per [[RFC8032]].
+                </p>
               </li>
               <li>
                 <p>
@@ -10420,29 +10415,19 @@ <h5>Verify</h5>
                   If the key data of |key| represents an invalid point or a small-order element
                   on the Elliptic Curve of Ed25519, return `false`.
                 </p>
-                <div class="issue">
-                  <p>
-                    Not all implementations perform this check.
-                  </p>
-                  <p>
-                    See <a href="https://github.com/WICG/webcrypto-secure-curves/issues/27">WICG/webcrypto-secure-curves issue 27</a>.
-                  </p>
-                </div>
+                <p class="issue" data-number="423">
+                  Not all implementations perform this check.
+                </p>
               </li>
               <li>
                 <p>
                   If the point R, encoded in the first half of |signature|,
                   represents an invalid point or a small-order element
                   on the Elliptic Curve of Ed25519, return `false`.
                 </p>
-                <div class="issue">
-                  <p>
-                    Not all implementations perform this check.
-                  </p>
-                  <p>
-                    See <a href="https://github.com/WICG/webcrypto-secure-curves/issues/27">WICG/webcrypto-secure-curves issue 27</a>.
-                  </p>
-                </div>
+                <p class="issue" data-number="423">
+                  Not all implementations perform this check.
+                </p>
               </li>
               <li>
                 <p>