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)

content/birthday/index.md

@@ -0,0 +1,13 @@
+---
+title: "🎉 Cranky Birthday Boy on VHS Tape 📼"
+date: 1996-02-06 00:01:01-0400
+url: "/birthday"
+image: "thumb.png"
+type: videos
+layout: video
+resources:
+- src: "birthday.mp4"
+- src: "birthday.webm"
+- src: "images/thumb.png"
+- src: "subs.en.vtt"
+---