Detect missing references on build (#74)

* Detect missing references on build

Using spec-prod configuration to detect when the spec uses undefined references https://github.com/w3c/spec-prod/blob/main/docs/options.md#build_fail_on
Per #73 (comment)

* Disambiguate autolink on resolve

.github/workflows/auto-publish.yml

@@ -15,3 +15,4 @@ jobs:
           GH_PAGES_BRANCH: gh-pages
           W3C_WG_DECISION_URL: "https://lists.w3.org/Archives/Public/public-webrtc/2016Mar/0031.html"
           VALIDATE_LINKS: false
+          BUILD_FAIL_ON: link-error

index.bs

@@ -13,6 +13,9 @@ Abstract: This API defines an API surface for manipulating the bits on
 Abstract: {{MediaStreamTrack}}s being sent via an {{RTCPeerConnection}}.
 Markup Shorthands: css no, markdown yes
 </pre>
+<pre class=link-defaults>
+spec:webidl; type:dfn; text:resolve
+</pre>
 <pre class=biblio>
 {
   "WEB-CODECS": {