Remove JWK "alg" field (#24)

The `alg` field is not required and might change in the future, see
https://www.ietf.org/archive/id/draft-jones-jose-fully-specified-algorithms-00.html.

* Revert "Set and check "alg" JWK property for EdDSA keys (#3)"

This reverts commit bf5f161.

* Revert "Update JWK mappings for Ed25519 and Ed448 (#4)"

This reverts commit 5d58d49.

index.html

@@ -2241,14 +2241,6 @@ <h4>Operations</h4>
                         {{DataError}}.
                       </p>
                     </li>
-                    <li>
-                      <p>
-                        If the {{JsonWebKey/alg}} field of |jwk| is present and is
-                        not "`EdDSA`",
-                        then [= exception/throw =] a
-                        {{DataError}}.
-                      </p>
-                    </li>
                     <li>
                       <p>
                         If |usages| is non-empty and the {{JsonWebKey/use}} field of |jwk| is present and is
@@ -2543,12 +2535,6 @@ <h4>Operations</h4>
                         "`OKP`".
                       </p>
                     </li>
-                    <li>
-                      <p>
-                        Set the `alg` attribute of |jwk| to
-                        "`EdDSA`".
-                      </p>
-                    </li>
                     <li>
                       <p>
                         Set the `crv` attribute of |jwk| to
@@ -3148,14 +3134,6 @@ <h4>Operations</h4>
                         {{DataError}}.
                       </p>
                     </li>
-                    <li>
-                      <p>
-                        If the {{JsonWebKey/alg}} field of |jwk| is present and is
-                        not "`EdDSA`",
-                        then [= exception/throw =] a
-                        {{DataError}}.
-                      </p>
-                    </li>
                     <li>
                       <p>
                         If |usages| is non-empty and the {{JsonWebKey/use}} field of |jwk| is present and is
@@ -3450,12 +3428,6 @@ <h4>Operations</h4>
                         "`OKP`".
                       </p>
                     </li>
-                    <li>
-                      <p>
-                        Set the `alg` attribute of |jwk| to
-                        "`EdDSA`".
-                      </p>
-                    </li>
                     <li>
                       <p>
                         Set the `crv` attribute of |jwk| to
@@ -3638,8 +3610,7 @@ <h3>Algorithm mappings</h3>
           <td>
 <pre class=js>
 { kty: "OKP",
-  crv: "Ed25519",
-  alg: "EdDSA" }
+  crv: "Ed25519" }
 </pre>
           </td>
           <td>
@@ -3652,8 +3623,7 @@ <h3>Algorithm mappings</h3>
           <td>
 <pre class=js>
 { kty: "OKP",
-  crv: "Ed448",
-  alg: "EdDSA" }
+  crv: "Ed448" }
 </pre>
           </td>
           <td>