Update illuaminate again

- Generate theme-color. Hopefully this time it works!
 - Specify a site url. Technically this is wrong (we should use the
   current git branch), but it's good enough for now.
 - Move some options into a sub-category.

doc/head.html

@@ -0,0 +1 @@
+<meta name="theme-color" content="#c8d87c">

illuaminate.sexp

@@ -10,13 +10,18 @@
 
 
 (doc
-  (title "CC: Tweaked")
   (destination build/docs/lua)
-  (logo src/main/resources/pack.png)
   (index doc/index.md)
-  (styles src/web/styles.css)
-  (scripts build/rollup/index.js)
-  (source-link https://github.com/SquidDev-CC/CC-Tweaked/blob/${commit}/${path}#L${line})
+
+  (site
+    (title "CC: Tweaked")
+    (logo src/main/resources/pack.png)
+    (url https://tweaked.cc/)
+    (source-link https://github.com/SquidDev-CC/CC-Tweaked/blob/${commit}/${path}#L${line})
+
+    (styles src/web/styles.css)
+    (scripts build/rollup/index.js)
+    (head doc/head.html))
 
   (module-kinds
     (peripheral Peripherals)