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/humans.txt

@@ -0,0 +1,47 @@
+          ##
+   ###----##
+   ###      \
+   /        ##__
+  /       ##   #     --#
+ :           __/   -#   :
+,'          _\     >     :
+####      :'     #########:
+##########          |  ###:
+######################    :
+#######################   :
+######################...,'
+            :
+             ;
+              ;
+               ;
+              ,;
+           ;##########
+          ;###########
+,,,,,,,,,;###########
+
+# humanstxt.org/
+# The humans responsible & technology colophon
+
+# HUMAN
+
+    Jake Jarvis <jake@jarv.is>
+    @jakejarvis
+
+# TECHNOLOGY
+
+    Hugo extended
+    GitHub Pages
+    GitHub Actions
+    Commento
+    Fathom Analytics
+
+# VIEW SOURCE
+
+    https://go.jarv.is/source
+
+# LICENSE
+
+    All content is licensed under CC-BY-4.0, an
+    open & permissive Creative Commons license.
+
+    https://jarv.is/license.txt