Reorganise source files into src and web

Use a more traditional source code layout with the code located in the
src/ dir and static web content in the web/ dir, while the other places
are for data not related to code or content.

tsconfig.json

@@ -1,9 +1,8 @@
 {
-	"files": ["cli.ts"],
-	"include": ["content", "utils"],
+	"include": ["src"],
 	"compilerOptions": {
 		"outDir": "build/node",
-		"rootDir": ".",
+		"rootDir": "src",
 
 		"jsx": "react-jsx",
 		"jsxImportSource": "antihtml",