Numerous improvements and bug fixes.

- Refactored themes to always load with just a single file. This avoids
  a round trip on each request.
- Locally load font when available on the system, then try to
  load the woff2 file, then fall back to regular woff.
- Update markup to use relative urls where it is safe. RSS feeds still
  use absolute URLs.
- Only set og:image:(height/width) when using the standard color icon.
- Fixed styles on the pagination buttons.
- Added ability to switch font to Source Code Pro (useSourceCodePro).
- Added yellow theme.
- Added grey theme.
- Bold and remove underline for active page in header.
- Removed markdownify on summary.
- Only display date if present.

layouts/_default/list.html

@@ -8,12 +8,14 @@
     {{ range .Paginator.Pages }}
       <div class="post on-list">
         <h1 class="post-title">
-          <a href="{{ .Permalink }}">{{ .Title | markdownify }}</a>
+          <a href="{{ .RelPermalink }}">{{ .Title | markdownify }}</a>
         </h1>
         <div class="post-meta">
+          {{ with .Date }}
           <span class="post-date">
-            {{ .Date.Format "2006-01-02" }}
+            {{ .Format "2006-01-02" }}
           </span>
+          {{ end }}
           {{ with .Params.Author }}
             <span class="post-author">:: {{ . }}</span>
           {{ end }}
@@ -22,7 +24,7 @@
         {{ if .Params.tags }}
           <span class="post-tags">
             {{ range .Params.tags }}
-            #<a href="{{ (urlize (printf "tags/%s/" . )) | absLangURL }}">
+            #<a href="{{ (urlize (printf "tags/%s/" . )) | relLangURL }}">
               {{- . -}}
             </a>&nbsp;
             {{ end }}
@@ -38,7 +40,7 @@
           {{ else if .Description }}
             {{ .Description | markdownify }}
           {{ else }}
-            {{ .Summary | markdownify }}
+            {{ .Summary }}
           {{ end }}
         </div>