huge refactoring of content and theme

- de-personalize the theme as much as possible, moving personal info into config.toml parameters
- extract hard-coded content out layouts and into actual /content (especially home page and all of its assets)
- include full text of posts in RSS feed (aka making the world a better place)
- use abstract layout for both video pages (/leo and /birthday)

layouts/404.html

@@ -50,6 +50,5 @@
       <h1>Welp, this is awkward... &#x1F633;</h1>
       <p>The file you asked for wasn't found in this neck of the woods. Please check the URL for mistakes and try again, or take your ball and <a href="{{ .Site.BaseURL }}">go home</a>.</p>
     </div>
-{{ if eq hugo.Environment "production" }}{{ partial "stats.html" . }}{{ end }}
   </body>
 </html>