version history MVP

implement basic version history support; there's now an icon in the footer that lets you see the previous versions and their sources
I'm a bit worried about spoilers but honestly it's yet another way to hint yourself at the cool secrets so I don't mind

admin/daemon.bash

@@ -11,8 +11,9 @@ mkfifo $reload_fifo
 
 reload() {
     # This just kind of assumes regeneration doesn't take too long.
+    cargo build --release
     kill "$treehouse_pid"
-    cargo run --release -- serve --port 8082 > "$build_log" 2>&1 &
+    cargo run --release -- serve --port 8082 --commits-only > "$build_log" 2>&1 &
     treehouse_pid="$!"
 }