Cleanup grind and add serving capability via dhttpd

pubspec.lock

@@ -73,6 +73,12 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.14.1"
+  dhttpd:
+    description:
+      name: dhttpd
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.1"
   front_end:
     description:
       name: front_end
@@ -246,7 +252,13 @@ packages:
       name: shelf
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.7.1"
+    version: "0.6.8"
+  shelf_cors:
+    description:
+      name: shelf_cors
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.1"
   shelf_packages_handler:
     description:
       name: shelf_packages_handler

pubspec.yaml

@@ -26,6 +26,7 @@ dependencies:
   tuple: ^1.0.1
   yaml: ^2.1.0
 dev_dependencies:
+  dhttpd: ^0.3.1
   grinder: ^0.8.0
   http: ^0.11.0
   meta: ^1.0.0

testing/test_package_docs/static-assets/readme.md

@@ -0,0 +1,19 @@
+# highlight.js
+
+Generated from https://highlightjs.org/download/ on 2017-08-30
+
+Included languages:
+
+* bash
+* css
+* dart
+* java
+* javascript
+* json
+* markdown
+* objectivec
+* ruby - dragged in by `yaml` - 🙄
+* shell
+* swift
+* xml - includes html
+* yaml

testing/test_package_docs/static-assets/sdk_footer_text.html

@@ -0,0 +1,4 @@
+•
+<span class="copyright no-break">
+  <a href="http://creativecommons.org/licenses/by-sa/4.0/">cc license</a>
+</span>