fix(deps): update dependency @material/web to v1

This CL also fixes many things necessary for the update.

It also changes the entire md3 theme, since there have been a lot of
breaking changes and this is the easiest way to have a working theme
again (it is also an improvement).

Change-Id: I4a412e0c0ca4345084c724fcaba000293521e907
diff --git a/src/workflows/manager/components/WorkflowDialog.js b/src/workflows/manager/components/WorkflowDialog.js
index 19ff796..e990246 100644
--- a/src/workflows/manager/components/WorkflowDialog.js
+++ b/src/workflows/manager/components/WorkflowDialog.js
@@ -40,13 +40,13 @@
         </wf-workflow-editor>
         <md-filled-button
             slot="primaryAction"
-            label="Save"
             @click=${this._save}>
+          Save
         </md-filled-button>
         <md-text-button
             slot="secondaryAction"
-            dialogAction="cancel"
-            label="Cancel">
+            dialogAction="cancel">
+          Cancel
         </md-text-button>
       </mwc-dialog>
     `;