Introduce CLI, watch server, and bundled assets

Add data-files and bundled templates/fonts/css to the package and
rename the executable to hakysidian (autogen Paths_hakysidian).
Refactor site.hs to parse CLI commands (build/clean/rebuild/watch),
start a preview server, snapshot inputs and run an incremental watch
loop, and move rules into a siteRules function. Update ChaoDoc and
filters to accept math-macros, and add favicon links to templates.

makefile

@@ -1,5 +1,6 @@
 
 COMMANDS := build watch rebuild clean
+BIN := hakysidian
 .PHONY: $(COMMANDS), publish
 
 # Set the default goal, so running 'make' without arguments will run 'make build'.
@@ -7,20 +8,20 @@ COMMANDS := build watch rebuild clean
 
 
 # --- 
-$(COMMANDS): site
-	@echo "Running command: ./site $@"
-	-@./site $@
+$(COMMANDS): $(BIN)
+	@echo "Running command: ./$(BIN) $@"
+	-@./$(BIN) $@
 
 
 # --- Rules ---
 # using relative symlinks should be fine since everything only works at ./
 
 
-site: src/site.hs src/ChaoDoc.hs
-	cabal build
-	ln -sf "$(shell cabal list-bin exe:site)" site
+$(BIN): src/site.hs src/ChaoDoc.hs
+	cabal build exe:hakysidian
+	ln -sf "$(shell cabal list-bin exe:hakysidian)" $(BIN)
 
 # move from katex to mathjax
 # katex_cli:
 # 	cd katex_rust_fork && cargo build --release
-# 	ln -sf ./katex_rust_fork/target/release/katex_cli katex_cli
+# 	ln -sf ./katex_rust_fork/target/release/katex_cli katex_cli