Docserver: Reorganise the site templates into a single site.html file which

chrome/common/extensions/docs/templates/json/manifest.json

 {
   "app": {
     "documentation": "manifest/app.html",
     "example": {},
     "level": "required"
   },
   "app.background": {
     "example": {"scripts": ["background.js"]},
     "level": "required"
   },
@@ skipping 79 matching lines @@
   "minimum_chrome_version": {
     "documentation": "manifest/minimum_chrome_version.html",
     "example": "versionString"
   },
   "nacl_modules": {
     "documentation": "manifest/nacl_modules.html",
     "example": []
   },
   "name": {
     "documentation": "manifest/name.html#name",
-    "example": "My {{title}}",
+    "example": "My {{platform}}",
     "level": "required"
   },
   "offline_enabled": {
     "documentation": "manifest/offline_enabled.html",
     "example": true
   },
   "omnibox": {
     "documentation": "omnibox.html",
     "example": {
       "keyword": "aString"
@@ skipping 44 matching lines @@
   "version": {
     "documentation": "manifest/version.html",
     "example": "versionString",
     "level": "required"
   },
   "web_accessible_resources": {
     "documentation": "manifest/web_accessible_resources.html",
     "example": []
   }
 }