docs: update docset build to fetch data samples from absolute instead…

… of relative URL

package.json

@@ -54,7 +54,7 @@
     "schema": "mkdir -p build && ts-json-schema-generator -f tsconfig.json -p src/index.ts -t TopLevelSpec --no-type-check --no-ref-encode > build/vega-lite-schema.json && yarn renameschema && cp build/vega-lite-schema.json site/_data/",
     "renameschema": "scripts/rename-schema.sh",
     "presite": "yarn data && yarn schema && yarn build:site && yarn build:versions && scripts/create-example-pages.sh",
-    "docset": "yarn data && yarn schema && yarn build:site && yarn build:docset && yarn build:versions && scripts/create-example-pages.sh",
+    "docset": "yarn schema && yarn build:site && yarn build:docset && yarn build:versions && scripts/create-example-pages.sh",
     "site": "yarn site:only",
     "site:only": "pushd site && bundle exec jekyll serve -I -l && popd",
     "prettierbase": "prettier '**/*.{md,css,yml}'",

site/_layouts/base.html

@@ -9,8 +9,8 @@
 
     {% if site.is_docset_build == true %}
     <script>
-      // This is used for data fetching in code samples, we know exactly where this lives
-      const BASEURL = '{{site.baseurl}}';
+      // Docset doesn't serve JSON from a fileserver, so it needs to load data from github
+      const BASEURL = 'https://vega.github.io/vega-lite/';
     </script>
     {% else %} {% seo %}
     <script>

site/_layouts/plain.html

@@ -6,7 +6,7 @@
   <header>
     <nav class="page-centered">
       <div class="dropdown">
-        <a class="vl-title" href="{{ site.baseurl }}/index.html">{{ site.title }}</a>
+        <a class="vl-title" href="{{ site.baseurl }}/">{{ site.title }}</a>
         <div class="dropdown-content">
           <a href="https://vega.github.io/vega/">Vega</a>
           <a href="https://altair-viz.github.io/">Altair</a>