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.

hakysidian.cabal

@@ -1,13 +1,22 @@
+cabal-version:      2.4
 name:               hakysidian
 version:            0.1.0.0
 build-type:         Simple
-cabal-version:      >= 1.10
 
+data-files:
+    bib_style.csl
+    favicon.ico
+    css/*.css
+    fonts/*.otf
+    fonts/*.ttf
+    fonts/*.woff2
+    templates/*.html
 
-executable site
+executable hakysidian
   hs-source-dirs:   src
   main-is:          site.hs
-  other-modules:    ChaoDoc, SideNoteHTML, Pangu
+  other-modules:    ChaoDoc, SideNoteHTML, Pangu, Paths_hakysidian
+  autogen-modules:  Paths_hakysidian
   build-depends:    base   >= 4.18
                   , hakyll >= 4.15
                   , mtl >= 2.2.2
@@ -20,7 +29,11 @@ executable site
                   -- , process
                   -- , regex-compat
                   , array
+                  , directory
                   , filepath
+                  , time
+                  , wai-app-static
+                  , warp
                   -- , ghc-syntax-highlighter
                   -- , blaze-html >= 0.9
                   , megaparsec
@@ -34,4 +47,4 @@ executable site
                   -Wno-unsafe
                   -Wno-prepositive-qualified-module
                   -O2 -threaded -rtsopts -with-rtsopts=-N
-  default-language: Haskell2010
+  default-language: Haskell2010